Usage: osg-update-vos [--repo <repo>] [--location root|<destdir>]

Download VO data into a directory.

The `--location` argument specified the location to download VO data to.
If unspecified, or "root", will use `/etc` in an RPM install and
`$OSG_LOCATION/etc` in a tarball install.

VO data consists of a `vomses` file and `*.lsc` files in subdirectories
under `vomsdir`. The layout of the downloaded data is:

  <destdir>/vomses
  <destdir>/grid-security/vomsdir/*/*.lsc

The command-line argument `--repo` specifies the YUM repository to
download the VO data from. This defaults to the `osg` repository.