ipaconfig: Prevent configuration issues due to test failure.

ipaserver: Allow configuration of test server name.

As the server name was hard coded, when running tests for ipasever
module using a server not name as 'ipaserver', the tests would fail.

This patch allows the configuration of the server name using the
variable 'ipa_server_name', and if not provided, try to infer the name
from the ansible_hostname variable, or, if not possible, defaults to
'ipaserver'.

The same behavior is applied to 'ipasever_domain', with the default
being 'ipa.test'.

group: Fix nonposix, posix and external handling and conversions

Currently, if a test fails during execution of ipaconfig playbook
tests, or if the failed task is the task reverting to the original
configuration fails, the testing host might be left in a state that
may cause other tests to fail due to the inconsistent configuration
state.

This patch ensures that if a test fails, a known configuration, the
same as used is the default installation of FreeIPA used in upstream
CI, is applied to the host, providing safe environment for testing.

The nonposix, posix and external parameters need to be mutually
exclusive. external was missing in this list. Only one of the three
parameters can be used.

external can not be set to no/false. This results in an error now.

if nonposix is used, posix is set as not nonposix. The nonposix
parameter is not used within the code anymore..

New tests have been added to tests the addition of users with for
nonposix and posix groups. The tests for the external group is not
active due to the need of an AD.

Fixes: #528 (Error creating nonposix group)

Use execute_ipa_commands for sudocmd plugins.

config: Fix data returned from module.

When retrieving IPA configuration using ipaconfig module, a few
variables were not returning, and some data had the wrong data format.

This patch fix both issues and apply some refactoring, as data was
being retrieved from IPA API in different places using different
methods.

config: Remove unused code.

CI: pin ansible-core version for ansible-doc-test.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

Use gen_add_list and gen_intersection_list for sudocmd member handling,
to reduce the add lists to only the new and del lists only to existing
entries.

This enables to remove the ignores for "already a member" and
"not a member" errors.

Removed the definition of unused function 'gen_args()' from ipaconfig.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

This patch adds ansible-core version to 2.11 when evaluating
documentation with ansible-doc-test, so both 2.9 (ansible) and
2.11 (ansible-core) are covered when testing documentation,
along with the latest Ansible version available.

Fix documentation and usage of IPAAnsibleModule

Fix parameters used to IPAAnsibleModule.ipa_command, as a singlo list
was being used instead of a parameter list.

In the provided example for the class documentation, the parameters
passed to the `ipa_command` method were wrong, as a single list was
used instead of a parameter list.

Use execute ipa commands

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.

execute_ipa_commands replces the check mode exit, the loop over the
generated commands and also in the member failure handling for modules
with member support.