ipa_s2n_save_objects: properly handle fully-qualified group names
Check if the given name is already fully-qualified instead of adding a
domain name unconditionally.
Related to https://fedorahosted.org/sssd/ticket/2529
and https://fedorahosted.org/sssd/ticket/2524
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
(cherry picked from commit 9ad346318dc2cc5d5a340d8d981ddfdcc6f632da)