ceph: include type in ceph_entity_addr, filepath

Include a type/version in ceph_entity_addr and filepath.  Include extra
byte in filepath encoding as necessary.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c
index 81bc779..e4e8d44 100644
--- a/fs/ceph/messenger.c
+++ b/fs/ceph/messenger.c
@@ -1909,6 +1909,7 @@
 		msgr->inst.addr = *myaddr;
 
 	/* select a random nonce */
+	msgr->inst.addr.type = 0;
 	get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
 	encode_my_addr(msgr);