CatalogDiffTool - sort old and new listings before comparing
CatalogDiffTool - sort old and new listings before comparing

The sorting statements were lost during CVM-1268

cvmfs/cvmfs,djw8605/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,djw8605/cvmfs,djw8605/cvmfs,djw8605/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,djw8605/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs