Documentation fixes for issues found by ansible-test part of ansible-core 2.17.1

Fix default values for string list parameters where default is missing
in the DOCUMENTATION section, but is defined in argument_specs.

The ipa_client_installed option was named as client_configured in the
DOCUMENTATION section.

The default value for selinux_works was missing in the DOCUMENTATION
section.

DOCUMENTATOIN section: Fix required for name, add missing
delete_continue to services option.

The no_log tag is only allowed in the argument_spec, but not in the
DOCUMENTATION section. Set no_log=False for token_uri and
keys_uri=keys_uri in the argument_spec to enforce logging.

The element type for sshpubkey was using 'element' instead of 'elements'
also the type for nomembers was wrong in the DOCUMENTATION section.

Several fixes for the DOCUMENTATION section: The short_description tag
was 'short description', the chain option was missing and the unknown
authers tag has been removed.

In the freeipa inventoty plugin, fix version to 1.13.0 and drop unknown
tag plugin_type.

The default setting for delete_continue was True instead of true for
delete_continue in the DOCUMENTATION section.

tests/sanity/sanity.sh: Install setuptools with pip

user: Fix idp_user_id aliases

plugins/inventory/freeipa: Try imports for requests and urllib3

permission: Fix idempotency issues for DN parameters

README-service.md: Add multi service handling

Convert input certificates

ansible_freeipa_module: Fix errors in batch mode

Fixes for FreeIPA 4.12

setuptools might not be installed before importing and using
galaxy_importer. This could result in a backtrace by disabling
ANSIBLE_TEST_LOCAL_IMAGE in galaxy-importer.cfg to run latest tests.

The alias for idp_user_id was ipaidpconfiglink by mistake. It was
already correct (ipaidpsub) in the DOCUMENTATION section and also
in the README.

The EXAMPLES section only contained a very simple example for multi
service handling. The examples from the README have been added.

The service READNE so far lacks the documentation of multi service
handling within a single task.

The alias for the continue parameter was also added.

Fixes: #1113

Bump minimum supported Ansible version

The bindings for requests and urllib3 might not be available, especially
in the ansible-test fake execution test (next version). These imports are
now in a try exception clause to make sure that the fake execution test
will be passing and also that there is a better error message if the
bindings are missing.

urllib3.exceptions.InsecureRequestWarning is now also only disabled if
no certificate has been given for the verification of the connection.

ansible-freeipa roles do not work with Ansible 2.8 anymore, so the
minimum supported version is changed to 2.15, the oldest supported
Ansible version as of today.

This patch updates the minimum supported Ansible version and the list
of available modules.

ansible-freeipa roles do not work with Ansible 2.8 anymore, so the
minimum supported version is changed to 2.15, the oldest supported
Ansible version as of today.

ansible-freeipa roles do not work with Ansible 2.8 anymore, so the
minimum supported version is changed to 2.15, the oldest supported
Ansible version as of today.

ansible-freeipa roles do not work with Ansible 2.8 anymore, so the
minimum supported version is changed to 2.15, the oldest supported
Ansible version as of today.

ansible-freeipa roles do not work with Ansible 2.8 anymore, so the
minimum supported version is changed to 2.15, the oldest supported
Ansible version as of today.

ansible-freeipa roles do not work with Ansible 2.8 anymore, so the
minimum supported version is changed to 2.15, the oldest supported
Ansible version as of today.

ansible-freeipa roles do not work with Ansible 2.8 anymore, so the
minimum supported version is changed to 2.15, the oldest supported
Ansible version as of today.

ansible-freeipa roles do not work with Ansible 2.8 anymore, so the
minimum supported version is changed to 2.15, the oldest supported
Ansible version as of today.

This patch includes the change to the version number in the collection
and all plugin README files. The collection README was also update to
remove text that related only to previous Ansible versions.

The parameters

- subtree (ipapermlocation)
- target (ipapermtarget)
- targetto (ipapermtargetto)
- targetfrom (ipapermtargetfrom)

have not been idempotent as the result returned from permission_show was
a DN and not a string.

The find_permission function has been exetended to convert the values
for these parameters to strings.

Fixes: #1257

The error string returned by execute_ipa_commands in batch mode
additionally contains the whole parameter list for the command. This is
different to non batch mode execution and breaks tests that are checking
the returned error message.

A left over debug message also have been removed from the error
processing.

Certificates given by ansible could have leading and trailing white
space, but also multi line input is possible that also could have
leading and training white space and newlines.

Certificates given by ansible could have leading and trailing white
space, but also multi line input is possible that also could have
leading and training white space and newlines.

Certificates given by ansible could have leading and trailing white
space, but also multi line input is possible that also could have
leading and training white space and newlines.

Certificates given by ansible could have leading and trailing white
space, but also multi line input is possible that also could have
leading and training white space and newlines.