Update C++ server with new core API

And reflects the C++ API in ServerBuilder.
diff --git a/include/grpc/grpc.h b/include/grpc/grpc.h
index 4a720d1..2df80b1 100644
--- a/include/grpc/grpc.h
+++ b/include/grpc/grpc.h
@@ -436,6 +436,9 @@
 grpc_channel *grpc_channel_create(const char *target,
                                   const grpc_channel_args *args);
 
+/* Create a lame client: this client fails every operation attempted on it. */
+grpc_channel *grpc_lame_client_channel_create(void);
+
 /* Close and destroy a grpc channel */
 void grpc_channel_destroy(grpc_channel *channel);