Enable DNS roaming conditionally based on config parameter
Enable DNS roaming conditionally based on config parameter

The DNS roaming functionality (watching /etc/resolv.conf for changes)
is enabled conditionally through the CVMFS_DNS_ROAMING parameter.

The default value is ON (if the parameter is omitted).

DrDaveD/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs