Fix bug where slots get stuck in Preempting/Killing state.  #4807
Fix bug where slots get stuck in Preempting/Killing state.  #4807

This bug is triggered whan a v8.3.2 startd is claimed by a schedd with
STARTER_HANDLES_ALIVES = False (which is the case for any schedd older
than version 8.3.2), and then the startd fails to renew to slot lease.

htcondor/htcondor,neurodebian/htcondor,neurodebian/htcondor,neurodebian/htcondor,neurodebian/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,neurodebian/htcondor,htcondor/htcondor,htcondor/htcondor,neurodebian/htcondor,htcondor/htcondor,htcondor/htcondor,neurodebian/htcondor,neurodebian/htcondor,neurodebian/htcondor