internal/monitor: mark controllers as unavailable #114
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When we can't contact a controller, mark it as unavailable
and include the time so that we can know how long it's
been unavailable for.
We don't make this information available in the API yet
although we add the fields to the params in preparation
for that.
Also make some of the logging messages in JEM a little
more informative and less noisy (don't log when there's an error,
as the error will be logged at a higher level anyway).