test: remove tls for benchwrapper (#816)

We found a way to whitelist our usage of tls-less gRPC within g3, so this is
no longer necessary. Huzzah!

bin/README.md

@@ -9,5 +9,5 @@ bencharmking purposes.
 cd nodejs-storage
 npm install
 export STORAGE_EMULATOR_HOST=localhost:8080
-npm run benchwrapper -- --port 50051
+npm run benchwrapper -- --port 8081
 ```

bin/benchwrapper.js

@@ -14,8 +14,6 @@
  * limitations under the License.
  */
 
-const fs = require('fs');
-const path = require('path');
 const grpc = require('grpc');
 const protoLoader = require('@grpc/proto-loader');
 const {Storage} = require('../build/src');
@@ -59,19 +57,12 @@ function write(call, callback) {
   callback(null, null);
 }
 
-const keyPath = path.join(__dirname, 'certificate', 'server.key');
-const key = fs.readFileSync(keyPath);
-const certPath = path.join(__dirname, 'certificate', 'server.pem');
-const cert = fs.readFileSync(certPath);
-const pair = {private_key: key, cert_chain: cert};
-const creds = grpc.ServerCredentials.createSsl(cert, [pair]);
-
 const server = new grpc.Server();
 
 server.addService(storageBenchWrapper['StorageBenchWrapper']['service'], {
   read: read,
   write: write,
 });
 console.log('starting on localhost:' + argv.port);
-server.bind('0.0.0.0:' + argv.port, creds);
+server.bind('0.0.0.0:' + argv.port, grpc.ServerCredentials.createInsecure());
 server.start();