Use Fully Qualified Collection Name (FQCN) for ansible builtins. This is
ansible.builtin.set_fact instead of set_fact for example and aplies for
all actions that are part of ansible.builtin.
All the replaced ansible.builtins:
assert, command, copy, debug, fail, fetch, file, import_playbook,
import_tasks, include_role, include_tasks, include_vars, package,
set_fact, shell, slurp, stat, systemd
This patch add support for adding external members to ipagroup which
have the `external` attribute set. It adds another attribute to the
module, `external_members`, which is a list of users or groups from
an external trust, to be added to the group.
This patch requires server-trust-ad to be tested, as such, the tests
have been guarded by a test block, for when such tests are available
in ansible-freeipa CI.
Fixes issue #418
