FIX: send CatalogTraversal error to stderr instead of stdout
FIX: send CatalogTraversal error to stderr instead of stdout

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