'Gets a single host group from the array.'

def get_host_group(self, host_group_ref):

    path = '/storage-systems/{system-id}/host-groups/{object-id}'
    try:
        return self._invoke('GET', path, **{'object-id': host_group_ref})
    except exception.NetAppDriverException:
        raise exception.NotFound((_('Host    group    with    ref    %s    not    found') % host_group_ref))
