Removed unused sqlite persistence

Change-Id: I99f1ba3a222c657e2feaca72b9c7308b17987edf
Reviewed-on: http://review.couchbase.org/26920
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>