CBQE-0: more logs in _send_op with ERR_NOT_MY_VBUCKET

Change-Id: I12e6e7b7dbf184b90b7f79ff1e0867998d0808de
Reviewed-on: http://review.couchbase.org/32804
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>