CBD-1386:  SLOW down server build status to not overwhelm buildbot

Change-Id: Icb5d5179235c2e76a7fd63ce3ce45923c2033662
Reviewed-on: http://review.couchbase.org/39504
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>