IPA: check ghosts in groups found by uuid as well
With views and overrides groups are not allowed to have ghost members
anymore because the name of a member might be overridden. To achieve
this ghost members are looked up and resolved later during group
lookups. Currently this is only done for group lookups by name but
should happen as well if the group is looked up by uuid.
Resolves https://fedorahosted.org/sssd/ticket/2631
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>