added auth

src/grpc.rs

@@ -108,9 +108,7 @@ impl BrainDaemon for BrainDaemonMock {
                     &auth.signature,
                 )?;
             } else {
-                return Err(Status::unauthenticated(
-                    "Could not authenticate the daemon: could not extract auth signature",
-                ));
+                return Err(Status::unauthenticated("Could not authenticate the daemon"));
             }
         } else {
             return Err(Status::unauthenticated("Could not authenticate the daemon"));