update user agent

lib/services/core/serviceclient.js

@@ -29,7 +29,6 @@ var HttpResponseCodes = Constants.HttpConstants.HttpResponseCodes;
 var Logger = require('../../diagnostics/logger');
 
 var moduleVersion = require('../../../package.json').version;
-var operatingSystem = process.platform;
 
 var DEFAULT_PROTOCOL = Constants.HTTPS;
 
@@ -301,7 +300,7 @@ ServiceClient.prototype._performRequest = function (webResource, body, options,
 
 ServiceClient.prototype._tagRequest = function (requestOptions) {
   if (!this.userAgent) {
-    this.userAgent = util.format('Windows Azure SDK/%s (Node.js; %s)', moduleVersion, operatingSystem);
+    this.userAgent = util.format('Azure-SDK-for-Node.js/%s', moduleVersion);
   }
 
   requestOptions.headers[HeaderConstants.USER_AGENT] = this.userAgent;