If not retrying a NOT_MY_VBUCKET response, dispatch it

Change-Id: Iccc0fc7db983f90c5926dc3f4ae4c9bb707669bf
Reviewed-on: http://review.couchbase.org/29922
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>