Add dprintf() when sending SIGABRT to a hung child daemon.
Add dprintf() when sending SIGABRT to a hung child daemon.

Several developers were confused when a daemon said it was killing its
child daemon "hard" and the child exited with SIGABRT.

zhangzhehust/htcondor,htcondor/htcondor,zhangzhehust/htcondor,htcondor/htcondor,zhangzhehust/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,htcondor/htcondor,neurodebian/htcondor,htcondor/htcondor,htcondor/htcondor,djw8605/htcondor,htcondor/htcondor,neurodebian/htcondor,zhangzhehust/htcondor,djw8605/htcondor,neurodebian/htcondor,neurodebian/htcondor,djw8605/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,djw8605/htcondor,neurodebian/htcondor,djw8605/htcondor,neurodebian/htcondor,djw8605/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,htcondor/htcondor,djw8605/htcondor,djw8605/htcondor,zhangzhehust/htcondor,htcondor/htcondor,zhangzhehust/htcondor,djw8605/htcondor