MB-100 add empty newline between interval

Change-Id: Ib16e27e6f2ca679c3f180964a4247c8c0ca85c08
Reviewed-on: http://review.couchbase.org/24984
Tested-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Thuan Nguyen <soccon@gmail.com>