Remove unused variables from get replica

We don't use the VBC stuff there anyways

Change-Id: Id07267013a87e09884c94677e5279cf593720450
Reviewed-on: http://review.couchbase.org/35032
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>