dnsconfig: add support for 'action: member'.

This patch adds support for 'action: member' for ipadnsconfig plugin,
impacting management of DNS forwarders setting.

Use of 'state: absent' now requires 'action: member'. With 'state:
present', orwarders can be either defined through 'action: dnsconfig'
or added using 'action: member'.

Tests have been updated to reflec the new behavior.

sudorule: fix idempotence issues and refactor.

This change refactors member management for ipasudorule module and
fixes idempotence issues related to case insensitive comparison.

dnsconfig: Fix management of forwarders.

ipahostgroup: Ensure host members are lowercase and FQDN

If one tries to set a list of forwarders which include an already
existing forwarder, the existing forwarder is removed, and the list
of configured forwarders contain only the new ones.

This patch fixes this behavior by setting a union of the currently
available forwarders and the list of forwarders provided in the
playbook.

Tests were added to ensure this behavior.

The host members of ipahostgroup need to be lowercase and FQDN to be
able to do a proper comparison with exising hosts in the hostgroup.

Fixes: #666 (ipahostgroup not idempotent and with error)

README test: Also check role readme files

The test is now also checking that role README files are mentioned in
the main README.

ipaclient_get_keytab: Do not use gssapi for kinit_keytab

Due to a change in Ansible to depend on Python 3.8 it is needed to only
use bindings that are provided by Python and Ansible core. gssapi is
therefore not usable any more.

The kinit_keytab function was using gssapi and now has to use the kinit
command insead.

README.md: Add automount key and map, fix ref to hbacsvcgroup and test

The main REAADME has been fixed to contain information about the
automount key and map modules, the reference to the hbacsvcgroup README
has been fixed and a new test has been added as a github workflow.

hbacrule: Fix member management idempotence issues.

iparole: Fix idempotence issues

ansible-test: Fix new findings

ERROR: Found 6 pylint issue(s) which need to be resolved:
ERROR: plugins/modules/ipaserver_prepare.py:395:4: invalid-name: Variable name "e" doesn't conform to snake_case naming style
ERROR: roles/ipaserver/library/ipaserver_prepare.py:395:4: invalid-name: Variable name "e" doesn't conform to snake_case naming style
ERROR: roles/ipaserver/module_utils/ansible_ipa_server.py:333:12: invalid-name: Variable name "ds" doesn't conform to snake_case naming style
ERROR: roles/ipaserver/module_utils/ansible_ipa_server.py:348:12: invalid-name: Variable name "ds" doesn't conform to snake_case naming style
ERROR: roles/ipaserver/module_utils/ansible_ipa_server.py:361:12: invalid-name: Variable name "ip" doesn't conform to snake_case naming style
ERROR: roles/ipaserver/module_utils/ansible_ipa_server.py:364:12: invalid-name: Variable name "e" doesn't conform to snake_case naming style

e has been replaced with err, ds with _ds, ip with _ip.

build-galaxy-release.sh: Use build dir, new options, checks, no reset

Members of hbacrule must be compared in a case insensitive manner.
This patch fixes comparation of member parameters against existing
members by converting parameters to lowercase.

Also, there were some cases where a change with an empty set of members
was issued to IPA API, leading to a result of 'changed: yes' when
'changed: no' was expected. The fix involved a refactoring of the
member management code.

Add a task to FreeIPA facts task file to ensure that the variable
'ipaserver_domain' is set.

The value is set form `ansible_facts['fqdn'], if available, or set to
`ipa.test`, otherwise.

hbacsvcgroup: Fix member management idempotence issues.

Enable pylint for ansible-freeipa roles.

pre-commit: Use system shellcheck.

pre-commit: Update ansible-lint version to v5.3.2

The official ShellCheck pre-commit hook uses a docker image, but it
is, sometimes, unavailable. This change will use the system installed
ShellCheck executable and does not depend on the image download.

This fixes the import error for render_group from rich.console.

Github Workflows: Run ansible-lint without an action.

We used a Github Action to run anisble-lint, but it has not have a
release since 2019, and has not been updated in a year. This action is
showing some issues when evaluating current playbooks.

This PR substitute the action previously used with a shell script
directly define in the workflow job. The ansible-core version was
pinned to the currently available on Fedora 25, 2.11.6.

The test playbook provided adds some tests to verify if capitalization
of role members does not influence on the module behavior. It also adds
some tests to verify check_mode.

Renamed function and improved its documentation to better explain  its
use and goals.

IPA role members users, groups, hostgroups and privilege must be
compared in a case insensitive way, and either are stored in lowercase
or IPA API fixes the value for proper representation.

This patch forces all comparisons of this values to be performed in
lowercase, and also only modify the values if it is really needed.

IPA Role host members should always be lowercase and FQDN. This
patch ensure that hosts are correctly compared and added as role
members.

Some attributes retrieved by the IPA API backend don't change, and are
used more than once, in different places of the code. IPA API domain
is one of these attributes.

This patch adds a cache to the attribute, so there is only one request
for the API, improving access time to the object and alowing multiple
calls with no efficiency penalty.

Service members in IPA role objects must be compared ignoring character
capitalization, but are stored in a case preserving manner.

This patch modifies the way service members are handled, creating a map
between a lowercase version of the service parameter and the parameter
itself, and using the map key to compare against existing services. The
mapped value is then added as role member, if necessary.

Removed custom code used to create add/del lists in iparole in favor
of ansible_freeipa_module functions, and custom result_handler, to
reduce code duplication, as these methods have equivalent shared
versions.

There was some unused code that was removed.

ansible-test fixes

ERROR: plugins/modules/ipaautomountmap.py:118:30: E203: whitespace before ':'

ERROR: Found 1 compile issue(s) on python 2.6 which need to be resolved:
ERROR: plugins/modules/ipasudorule.py:382:63: SyntaxError: {ensure_fqdn(value.lower(), default_domain) for value in host}