Decouple lcb_N_t from versioning info

Change-Id: Ie63ac7f13b31ebefbff7efb47aed8075f2aa8904
Reviewed-on: http://review.couchbase.org/32558
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>