(#7501)  Split cmd_drain_policies into four different tests, part 2.  Add test_job_policy_while_draining.
(#7501)  Split cmd_drain_policies into four different tests, part 2.  Add test_job_policy_while_draining.

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