MB-100: added cbr sanity test

Change-Id: I9e2e0896461ae3a7b7c27fb2919fb9fcddb03408
Reviewed-on: http://review.couchbase.org/26592
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>