ceph: allow closing session in restarting/reconnect state

CEPH_MDS_SESSION_{RESTARTING,RECONNECTING} are for for mds failover,
they are sub-states of CEPH_MDS_SESSION_OPEN. So __close_session()
should send close request for session in these two state.
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/mds_client.h

@@ -148,9 +148,9 @@ enum {
 	CEPH_MDS_SESSION_OPENING = 2,
 	CEPH_MDS_SESSION_OPEN = 3,
 	CEPH_MDS_SESSION_HUNG = 4,
-	CEPH_MDS_SESSION_CLOSING = 5,
-	CEPH_MDS_SESSION_RESTARTING = 6,
-	CEPH_MDS_SESSION_RECONNECTING = 7,
+	CEPH_MDS_SESSION_RESTARTING = 5,
+	CEPH_MDS_SESSION_RECONNECTING = 6,
+	CEPH_MDS_SESSION_CLOSING = 7,
 	CEPH_MDS_SESSION_REJECTED = 8,
 };