Do not run unittests on mac for travis
Do not run unittests on mac for travis

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