skip IPv6 tests if no IPv6 address available
skip IPv6 tests if no IPv6 address available

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