libceph: be less chatty about stray replies

There are many (normal) conditions that can lead to us getting
unexpected replies, include cluster topology changes, osd failures,
and timeouts.  There's no need to spam the console about it.
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>

net/ceph/osd_client.c

@@ -2037,7 +2037,7 @@ static struct ceph_msg *get_reply(struct ceph_connection *con,
 	if (!req) {
 		*skip = 1;
 		m = NULL;
-		pr_info("get_reply unknown tid %llu from osd%d\n", tid,
+		dout("get_reply unknown tid %llu from osd%d\n", tid,
 		     osd->o_osd);
 		goto out;
 	}