add `History::Tag::GetChannelName`
add `History::Tag::GetChannelName`

trshaffer/cvmfs,djw8605/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,Moliholy/cvmfs,trshaffer/cvmfs,trshaffer/cvmfs,djw8605/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,cvmfs-testing/cvmfs,alhowaidi/cvmfsNDN,djw8605/cvmfs,cvmfs/cvmfs,reneme/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,alhowaidi/cvmfsNDN,MicBrain/cvmfs,Moliholy/cvmfs,trshaffer/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,reneme/cvmfs,cvmfs-testing/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,MicBrain/cvmfs,reneme/cvmfs,djw8605/cvmfs,Gangbiao/cvmfs,MicBrain/cvmfs,cvmfs-testing/cvmfs,alhowaidi/cvmfsNDN,DrDaveD/cvmfs,reneme/cvmfs,cvmfs-testing/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,cvmfs-testing/cvmfs,Moliholy/cvmfs,MicBrain/cvmfs,djw8605/cvmfs,cvmfs/cvmfs,Moliholy/cvmfs,MicBrain/cvmfs,Gangbiao/cvmfs,trshaffer/cvmfs,DrDaveD/cvmfs,reneme/cvmfs,DrDaveD/cvmfs