Updating to latest masters

Deployed new service (f6f3788da146e92dce8dcb11a14479c8b117f2be):
* Ensure we exit when `clear-host-cache` is done.
* Don't swallow output from helper scripts unless `--quiet` is given.
* Separate out `download` and `download_file` commands.

Change-Id: Ib26ac3e8d3f63d2e435802d3db77a56829219f4c
Merge branch 'master' into wmf-deploy

Change-Id: Ib7250cadaca7745b4875426ea8b361d5566529bb