fix: bind redis proxy to all interfaces (#2559)

Sometimes docker in CI resolves localhost to an ip4 address, sometimes
an ip6 address so just bind to all interfaces.

interop/.aegir.js

@@ -68,7 +68,7 @@ export default {
       }
 
       const proxyServer = http.createServer(requestListener)
-      await new Promise(resolve => { proxyServer.listen(0, 'localhost', () => { resolve() }) })
+      await new Promise(resolve => { proxyServer.listen(0, () => { resolve() }) })
 
       return {
         redisClient,