Refactor: move files to prepare for merge with libvbucket

Change-Id: I15dfb8ef39548e3a84f8ead7503243ad76121e8f
Reviewed-on: http://review.couchbase.org/34630
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>