Documented fix for problem in which master tries to use UDP to update collector that has no UDP port.
Documented fix for problem in which master tries to use UDP to update collector that has no UDP port.

===GT=== #2555
===VersionHistory:Complete===

zhangzhehust/htcondor,zhangzhehust/htcondor,bbockelm/condor-network-accounting,mambelli/osg-bosco-marco,zhangzhehust/htcondor,djw8605/htcondor,zhangzhehust/htcondor,zhangzhehust/htcondor,bbockelm/condor-network-accounting,zhangzhehust/htcondor,mambelli/osg-bosco-marco,neurodebian/htcondor,bbockelm/condor-network-accounting,djw8605/condor,htcondor/htcondor,htcondor/htcondor,djw8605/condor,bbockelm/condor-network-accounting,mambelli/osg-bosco-marco,neurodebian/htcondor,htcondor/htcondor,bbockelm/condor-network-accounting,mambelli/osg-bosco-marco,djw8605/htcondor,mambelli/osg-bosco-marco,neurodebian/htcondor,neurodebian/htcondor,neurodebian/htcondor,htcondor/htcondor,djw8605/htcondor,djw8605/condor,mambelli/osg-bosco-marco,djw8605/htcondor,djw8605/htcondor,bbockelm/condor-network-accounting,htcondor/htcondor,djw8605/condor,djw8605/htcondor,zhangzhehust/htcondor,htcondor/htcondor,mambelli/osg-bosco-marco,neurodebian/htcondor,djw8605/condor,neurodebian/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,htcondor/htcondor,djw8605/condor,mambelli/osg-bosco-marco,neurodebian/htcondor,djw8605/htcondor,djw8605/condor,djw8605/condor,bbockelm/condor-network-accounting,htcondor/htcondor,bbockelm/condor-network-accounting,djw8605/htcondor,zhangzhehust/htcondor,djw8605/htcondor