monitoring: Teach monit to monitor grains and squid3.
monitoring: Teach monit to monitor grains and squid3.

If they crash or we are restarted, monit will make sure to restart these
applications for us, so we don't have to worry or restart them manually
ourselves.

BUG=None
TEST=None
R=jcgregorio@google.com

Review URL: https://codereview.chromium.org/658263002

Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot