* Support the -norsync argument to only remove the existing build chroots

  on a disconnected client, without running the time-consuming rsyncs.
  This is useful when a build is interrupted and needs to be restarted.

* After we have cleaned up the machine, reset the queue counter by using
  pollmachine -queue.  This has a race condition if other builds are being
  dispatched to the machine (e.g. builds on another branch):

  getmachine can claim a directory and increment the counter, then the
  machine is polled and finds e.g. 0 chroots in use, and resets the
  counter to 0, then claim-chroot is run and the build dispatched, with
  the counter now off-by-one.  This could be fixed by running
  claim-chroot with the .lock held, but this turns out to be too
  time-consuming.  A two-level lock approach might also fix this
  efficiently.

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