libceph: create messenger with client

This simplifies the init/shutdown paths, and makes client->msgr available
during the rest of the setup process.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
index 5637551..95bd850 100644
--- a/include/linux/ceph/libceph.h
+++ b/include/linux/ceph/libceph.h
@@ -215,7 +215,9 @@
 extern int ceph_compare_options(struct ceph_options *new_opt,
 				struct ceph_client *client);
 extern struct ceph_client *ceph_create_client(struct ceph_options *opt,
-					      void *private);
+					      void *private,
+					      unsigned supported_features,
+					      unsigned required_features);
 extern u64 ceph_client_id(struct ceph_client *client);
 extern void ceph_destroy_client(struct ceph_client *client);
 extern int __ceph_open_session(struct ceph_client *client,