Curently, storage nodes only report their capacity to satellites
once per hour. If a node fills up, it will fail all uploads until
the next contact cycle begins. With these changes, at the end of an
upload we check whether the MinimumDiskSpace threshold has been
passed. If so, trigger the monitor chore to update the node's
capacity, then trigger the contact chore to report the new
capacity to the satellites
Change-Id: Ie6aadaade1e2c12c87e03f8ff9059a50121380a0
more trustworthy downtime tracking
Detection chore: Do not update downtime at all from the detection chore.
We only want to include downtime between two explicitly failed ping attempts
(the duration between last contact success and the first failed ping is no longer
included in downtime calculation)
Estimation chore: If the satellite started after the last failed ping for a node,
do not include offline time since the last failed ping time - only
estimate based on two failed pings with no satellite downtime in
between.
This protects us from including satellite downtime in our storagenode downtime calculations.
Change-Id: I1fddc9f7255a7023e02474255d70c64faae75b8a
