Fix/http plugin issue (#9)

* support segment send service and app register service

* Fix http plugin issue and application register issue

lib/plugins/supported/http.js

@@ -82,6 +82,9 @@ module.exports = function(httpModule, instrumentation, contextManager) {
       let contextCarrier = new ContextCarrier();
       let span = contextManager.createExitSpan(options.path, options.host + ":" + options.port, contextCarrier);
       contextCarrier.pushBy(function(key, value) {
+        if (!options.hasOwnProperty("headers")) {
+          options.headers = {};
+        }
         options.headers[key] = value;
       });
       span.component(componentDefine.Components.HTTP);

lib/services/application-register-service.js

@@ -69,7 +69,7 @@ AppAndInstanceDiscoveryService.prototype.instanceDiscovery = function(applicatio
   let instanceParameter = new DiscoveryServiceParameters.ApplicationInstance();
   instanceParameter.setApplicationid(applicationId);
   instanceParameter.setOsinfo(buildOsInfo());
-  instanceParameter.setRegistertime(new Date().getMilliseconds());
+  instanceParameter.setRegistertime(new Date().getTime());
   instanceParameter.setAgentuuid(this._processUUID);
 
   this._instanceDiscoveryServiceStub.registerInstance(instanceParameter, function(err, response) {