CCBC-365: Restore syncmode

Change-Id: Id0937aca06eed9bc44b6f4c415f7f20c9e01dc40
Reviewed-on: http://review.couchbase.org/38161
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>