Fix process kill and added env for proxy v1

Author: kanhaiya

lib/tunnel.js

@@ -469,20 +469,15 @@ function killRunningProcess_(that, fnCallback) {
     if (that.proc && that.infoAPIPort) {
       var url = 'http://127.0.0.1:' + that.infoAPIPort + '/api/v1.0/stop';
       var parseURL = urlParse.parse(url);
-      var data = '';
       var reqOptions = {
         hostname: parseURL.hostname,
         port: parseURL.port,
         path: parseURL.path,
-        method: 'DELETE',
-        headers: {
-          'Content-Type': 'application/json',
-          'x-ml-auth': 'LambdaTest',
-          'Content-Length': data.length
-        }
+        method: 'DELETE'
       };
 
       var req = http.request(reqOptions, resp => {
+        resp.on('data', () => {})
         resp.on('end', () => {
           if (resp.statusCode != 200) {
             killProcess_(that, fnCallback);
@@ -502,7 +497,7 @@ function killRunningProcess_(that, fnCallback) {
         );
         return fnCallback(e);
       });
-      req.write(data);
+      req.write('');
       req.end();
     } else {
       return fnCallback();