Merge pull request #1412 from murgatroid99/node_stub_expose_address

Exposed server address string in stub
diff --git a/src/node/src/client.js b/src/node/src/client.js
index fad369c..b2b79e8 100644
--- a/src/node/src/client.js
+++ b/src/node/src/client.js
@@ -488,6 +488,7 @@
         callback(null, metadata);
       };
     }
+    this.server_address = address;
     this.channel = new grpc.Channel(address, options);
   }