MB-12268: Restore 'incorrect_master' functionality

This restores the old "hacky" way of handling not-my-vbuckets by
figuring out which other node the item should be mapped to, rather than
simply relying on the new (or current) vbucket config.

Change-Id: Ie58c38f80e2ffb37994d56dda8f973ec323035c0
Reviewed-on: http://review.couchbase.org/41840
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>