(HTCONDOR-815)  Add ClusterState.all_idle.
(HTCONDOR-815)  Add ClusterState.all_idle.

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