All imports that are only available after installing IPA need to be in a
try exception clause to be able to pass the fake execution test.
If the imports can not be done, all used and needed attributes are
defined with the value None, MODULE_IMPORT_ERROR is set to the import
error and fail_json is called.
Before "short description" was used in most plugins, modules and also
in the new module templates.
ansible-doc was therefore not showing the short description. To fix the
issue the flag was renamed to short_description instead.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2121362
'ansible-doc' -l lists most idm modules as 'UNDOCUMENTED'
Up to now a python snippet was used to get IPA_BACKUP_DIR from ipaplatform
but this was not working when ansible_facts was false due to not getting
ansible_python_interpreter set.
The module version is also working if gather_facts is turned off.
