Cvm 617

Removes CERN specific configuration from cvmfs package.  The configuration and public keys are provided in cvmfs-config-... packages.  The cvmfs-config-cern package replaces cvmfs-keys and cvmfs-init-scripts.
When I said "that belongs in domain.d/cern.ch.conf" I was referring to CVMFS_USE_GEOAPI=true, not CVMFS_DEFAULT_DOMAIN.