improve debug logging for AddEntry
improve debug logging for AddEntry

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