'Skip hosts that do not have etcd in their group names.'

def is_active(self):

    group_names = self.get_var('group_names', default=[])
    valid_group_names = ('etcd' in group_names)
    version = self.get_var('openshift', 'common', 'short_version')
    valid_version = (version in ('3.4', '3.5', '1.4', '1.5'))
    return (super(EtcdTraffic, self).is_active() and valid_group_names and valid_version)
