IPA: set SYSDB_INITGR_EXPIRE for RESP_USER_GROUPLIST
Since RESP_USER_GROUPLIST contains all group memberships it is
effectively an initgroups request hence SYSDB_INITGR_EXPIRE will be set.
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
(cherry picked from commit 62d919aea98edd1095f6a22241903d4c045b46ed)