This series addresses a performance problem which we seem to be
experiencing with the existing osstest resource planner in Xen Project
test colo.  The current setup can leave hosts idle for too long before
getting around to allocating them to test jobs.

There are also some reporting/debugging improvements.

The full explanation of the new algorithm is in the commit message for
  14/29 Planner: ms-queuedaemon: Restart planning when resources become free

Most of this series touches code in the central queue daemon, or in
command line tools, and is not subject to the osstest self-push-gate.

I have extensively tested this series in the Cambridge instance, where
this version of ms-queuedaemon is currently running and seems to be
happy.  The queuedaemon changes and the client (per-flight) changes
are fully compatible in both directions (except for Ian C's
out-of-mainline reporting tool which calls `get-plan' and is already
rather broken).


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