ipadnszone: add check mode support

dnszone: remove variable `serial`.

New IPAAnsibleModule class

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

Moved ipamodule_base_spec into IPAAnsibleModule.
This simplifies to add addtitional base vars to derived classes without
the need to dusplicae the code to extend argument_spec.

Removed execute_api_command.
This is not used anymore.

Removed get_ipamodule_base_vars.
This is not used anymore.

Removed self.ipaadmin_* and self.ccache_* from IPAAnsibleModule.__init__
These are not used and therefore can be removed.

execute_ipa_commands executes IPA API commands from the given command
list. With the handle_result and handle_result_user_args it is possible
to have a handling of the result return by the ipa commands for example
to return passwords.

Parameters

    commands: list of string tuple
        The list of commands in the form (name, command and args)
        For commands that do not require a 'name', None needs be
        used.
    handle_result: function
        The user function to handle results of the single commands
    handle_result_user_args: dict (user args mapping)
        The user args to pass to handle_result function

Example (ipauser module)

    def handle_result(result, command, name, args, exit_args):
        if "random" in args and command in ["user_add", "user_mod"] \
           and "randompassword" in result["result"]:
            exit_args.setdefault(name, {})["randompassword"] = \
                result["result"]["randompassword"]

    exit_args = {}
    changed = module.execute_ipa_commands(commands, handle_result,
                                          exit_args=exit_args)

    if len(names) == 1:
        ansible_module.exit_json(changed=changed,
                                 user=exit_args[names[0]])
    else:
        ansible_module.exit_json(changed=changed, user=exit_args)

Use IPAAnsibleModule methods and ipamodule_base_docs ducument fragment.

Use IPAAnsibleModule methods and ipamodule_base_docs ducument fragment.

By making IPAAnsibleModule the base class of FreeIPABaseModule, instead
of AnsibleModule, some methods on FreeIPABaseModule can be removed and
suport for commom parameters in modules using the older class can use
the same commom parameters (ipaadmin_principal and ipaadmin_password)
as the other parameters. This will also allow easier deprecation of
FreeIPABaseModule, which is hard to maintain.

To be able to use IPAAnsibleModule as the base class, it was moved
within the file, to position before FreeIPABaseModule declaration.

This patch also modifies IPAAnsibleModule by:

    * removing usage of `self` in methods not requiring it, turning
      the methods into @statimethod;

    * adding comments to all the methods in IPAAnsibleModule, which
      makes it easier to understand what the individual methods do,
      and what their parameters represent.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

iparole: Add 'new_name' as an alias to 'rename'.

templates: Use `become: no` in tests by default.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

ipaadmin_variables are handled by IPAAnsibleModule,
ansible_module.params_get is used to get the parameters and
ansible_module.ipa_connect is used to simplify the module.

Use IPAAnsibleModule and ipamodule_base_docs in the templates of
utils/new_module.

ipaadmin_password lines in the examples have been added, ipaadmin_
variables are handled by IPAAnsibleModule, ansible_module.params_get is
used to get the parameters and ansible_module.ipa_connect is used to
simplify the module.

ipamodule+member.py.in is additionally using gen_add_list and
gen_intersection_list to reduce the command calls to the changes only.

This class is an extended version of the Ansible Module that provides
IPA specific methods to simplify module generation.

Simple example:

    from ansible.module_utils.ansible_freeipa_module import \
        IPAAnsibleModule

    def main():
        ansible_module = IPAAnsibleModule(
            argument_spec=dict(
                  name=dict(type="str", aliases=["cn"], default=None),
                  state=dict(type="str", default="present",
                             choices=["present", "absent"]),
            ),
        )

        # Get parameters
        name = ansible_module.params_get("name")
        state = ansible_module.params_get("state")

        # Connect to IPA API
        with ansible_module.ipa_connect():

            # Execute command
            if state == "present":
                ansible_module.ipa_command(["command_add", name, {}])
            else:
                ansible_module.ipa_command(["command_del", name, {}])

        # Done

        ansible_module.exit_json(changed=True)

    if __name__ == "__main__":
        main()