add mount command to cvmfs_server help text
add mount command to cvmfs_server help text

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