Comment 1 for bug 1771634

https://review.rdoproject.org/jenkins/job/periodic-tripleo-centos-7-master-containers-build/908 is spinning now, watching that.

Also looking back thru previous builds from last night/this morning to determine frequency distribution of errors.

Note: curious that we're getting both 504 and 500...

(working) Hypothesis: we're running 16 threads in parallel, we could be swamping but this seems unlikely. more data will help here...