CBQE-0: reduce not_my_vbucket message log output

Change-Id: I25ec4fdabda145d9e799a34bc921a2b2bbe4336b
Reviewed-on: http://review.couchbase.org/32765
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>