forgot to update default monitor
forgot to update default monitor

Change-Id: I126ca3b776b5c355a641aeab1f6e0a8939136ee3
Reviewed-on: http://review.couchbase.org/c/perfrunner/+/152605
Reviewed-by: Bo-Chun Wang <bb86fd206c9c35341feb9b50e74a74a83e254d63@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner