Import PooledClient in its old location for backwards compat
Import PooledClient in its old location for backwards compat

ewdurbin/pymemcache,adamchainz/pymemcache,harlowja/pymemcache,dive-tv/pyelasticache_client,sontek/pymemcache,pinterest/pymemcache,sontek/pymemcache,thedrow/pymemcache,pinterest/pymemcache,bwalks/pymemcache,mbrukman/pymemcache