FIX: use standard tools to detect SELinux
FIX: use standard tools to detect SELinux

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