Reverts NCBC-719 - VBucket Forward Maps

Change-Id: I0b0e0e9607101e603c34fb303184e8617206c629
Reviewed-on: http://review.couchbase.org/43655
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>
Reviewed-by: Brett Lawson <brett19@gmail.com>