New automountlocation module

There is a new automount location management module placed in the plugins folder:

plugins/modules/ipaautomountlocation.py

This module allows to ensure presence and absence of automount locations
that act as containers for automount onjects in ipa.

Here is the documentation for the module:

README-automountlocation.md

New example playbooks have been added:

playbooks/automount/automount-location-absent.yml
playbooks/automount/automount-location-present.yml

New tests for the module:

tests/automount/test_automountlocation.yml