MB-100: revised cbr conf

Change-Id: I6d9ae6fafc4e0d0f32000a7ca1bc2accd9a8c8ee
Reviewed-on: http://review.couchbase.org/26173
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>