[CT] Do goma_ctl.py stop and start instead of a restart
[CT] Do goma_ctl.py stop and start instead of a restart

I have been noticing some strange goma bugs, seeing if this resolves things.

BUG=skia:

Review URL: https://codereview.chromium.org/1651213004

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot