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.
