Add a user-friendly error message when reconfig fails in condor_ce_config_generator (SOFTWARE-1705)
Add a user-friendly error message when reconfig fails in condor_ce_config_generator (SOFTWARE-1705)

This also fixes a Python 2.4 incompatibility (since
subprocess.CalledProcessError did not exist in Py2.4)

bbockelm/htcondor-ce,matyasselmeci/htcondor-ce,bbockelm/condor-ce-historic,opensciencegrid/htcondor-ce,bbockelm/condor-ce-historic,djw8605/htcondor-ce,brianhlin/htcondor-ce,bbockelm/htcondor-ce,brianhlin/htcondor-ce,brianhlin/htcondor-ce,matyasselmeci/htcondor-ce,bbockelm/htcondor-ce,djw8605/htcondor-ce,matyasselmeci/htcondor-ce,opensciencegrid/htcondor-ce,djw8605/htcondor-ce,opensciencegrid/htcondor-ce,bbockelm/condor-ce-historic