Switched verify-reviews from docker-build to prepared Docker image.
Switched verify-reviews from docker-build to prepared Docker image.

Review: https://reviews.apache.org/r/71421/

abudnik/mesos,dforsyth/mesos,abudnik/mesos,reneploetz/mesos,Gilbert88/mesos,Gilbert88/mesos,reneploetz/mesos,kaysoky/mesos,kaysoky/mesos,kaysoky/mesos,abudnik/mesos,kaysoky/mesos,Gilbert88/mesos,dforsyth/mesos,dforsyth/mesos,reneploetz/mesos,Gilbert88/mesos,abudnik/mesos,abudnik/mesos,Gilbert88/mesos,reneploetz/mesos,dforsyth/mesos,reneploetz/mesos,kaysoky/mesos,Gilbert88/mesos,abudnik/mesos,dforsyth/mesos,reneploetz/mesos,kaysoky/mesos,dforsyth/mesos,dforsyth/mesos,abudnik/mesos,reneploetz/mesos,kaysoky/mesos,Gilbert88/mesos