def _check_pillar_minions(self, expr, delimiter, greedy):
        return self._check_cache_minions(expr, delimiter, greedy, 'pillar')
called when a new service joins the registry (but not on keepalives).
dataset/ETHPy150Open saltstack/salt/salt/utils/minions.py/CkMinions._check_pillar_minions--crossover with--dataset/ETHPy150Open sccn/SNAP/src/rpyc/utils/registry.py/RegistryServer.on_service_added