fix /etc/fstab migration from 2.1.20 for trailing whitespaces (ported from 2.3)
fix /etc/fstab migration from 2.1.20 for trailing whitespaces (ported from 2.3)

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