Tweak NFS repo setup in _support_server to copy all files
    
    `cp -R foo/*` doesn't get all files in `foo/`, it misses hidden
    files. This turns out to be a problem with recent anaconda, as
    it expects to find a .treeinfo file here. So, let's use rsync.
    We could probably do this with cp too but I can't think of the
    right arguments right now...
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>