mon: fix mgr using auth_client_required policy

This caused mgr daemons to fail to authenticate
when auth_client_required was set to something
different to auth_cluster_required.

Fixes: https://tracker.ceph.com/issues/22096
Signed-off-by: John Spray <john.spray@redhat.com>
(cherry picked from commit 1e06fe0)

src/mon/MonClient.cc

@@ -366,7 +366,8 @@ int MonClient::init()
     method = cct->_conf->auth_supported;
   else if (entity_name.get_type() == CEPH_ENTITY_TYPE_OSD ||
 	   entity_name.get_type() == CEPH_ENTITY_TYPE_MDS ||
-	   entity_name.get_type() == CEPH_ENTITY_TYPE_MON)
+	   entity_name.get_type() == CEPH_ENTITY_TYPE_MON ||
+	   entity_name.get_type() == CEPH_ENTITY_TYPE_MGR)
     method = cct->_conf->auth_cluster_required;
   else
     method = cct->_conf->auth_client_required;