FIX: unittest2 check on Python 2.7
FIX: unittest2 check on Python 2.7

Moliholy/cvmfs,Moliholy/cvmfs,djw8605/cvmfs,Moliholy/cvmfs,Gangbiao/cvmfs,reneme/cvmfs,djw8605/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,trshaffer/cvmfs,trshaffer/cvmfs,DrDaveD/cvmfs,Gangbiao/cvmfs,trshaffer/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,alhowaidi/cvmfsNDN,reneme/cvmfs,Moliholy/cvmfs,reneme/cvmfs,cvmfs/cvmfs,djw8605/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,alhowaidi/cvmfsNDN,trshaffer/cvmfs,DrDaveD/cvmfs,trshaffer/cvmfs,DrDaveD/cvmfs,Moliholy/cvmfs,reneme/cvmfs,djw8605/cvmfs,reneme/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,djw8605/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs