bug 1648 - need to set vbucket ID during single-key a2b commands
bug 1648 - need to set vbucket ID during single-key a2b commands

This should fix any single-key simple (non-item) ascii commands
(delete, incr/decr), including single-key ascii GET's.

The code was incorrectly not putting the vbucket ID into the request
opaque field.  During a not-my-vbucket response, the opaque field
was always providing a vbucket ID that was incorrectly 0.

Change-Id: I9ee65760685835cb83e941d03da94fa80f6353e8
Reviewed-on: http://review.northscale.com/972
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Reviewed-by: Sean Lynch <9c3328a4a1f4f8f5c18b2d5b9057163c49b93ff3@literati.org>

membase/moxi,couchbase/moxi,couchbase/moxi,membase/moxi,steveyen/moxi,couchbase/moxi,couchbase/moxi,zbase/moxi,membase/moxi,couchbase/moxi,zbase/moxi,membase/moxi,steveyen/moxi,steveyen/moxi,couchbase/moxi,zbase/moxi,membase/moxi,steveyen/moxi,steveyen/moxi,membase/moxi,zbase/moxi,zbase/moxi