tests set_up_repository_services - reuse package tarball if possible
tests set_up_repository_services - reuse package tarball if possible

If a package archive with the proper SHA1 hash is already downloaded,
do not download it again.

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