ceph: remove recon_gen logic

We don't get an explicit affirmative confirmation that our caps reconnect,
nor do we necessarily want to pay that cost.  So, take all this code out
for now.

Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/mds_client.h

@@ -98,8 +98,6 @@ struct ceph_mds_session {
 	u64               s_seq;      /* incoming msg seq # */
 	struct mutex      s_mutex;    /* serialize session messages */
 
-	int               s_recon_gen; /* inc on reconnect to recovered mds */
-
 	struct ceph_connection s_con;
 
 	/* protected by s_cap_lock */