Merge pull request #1412 from murgatroid99/node_stub_expose_address

Exposed server address string in stub

src/node/src/client.js

@@ -488,6 +488,7 @@ function makeClientConstructor(methods) {
         callback(null, metadata);
       };
     }
+    this.server_address = address;
     this.channel = new grpc.Channel(address, options);
   }