(#6632)  Add default region config knob (step 2).
(#6632)  Add default region config knob (step 2).

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor