fix(instrumentations/amqplib): retain parent module context

Author: dszakallas

lib/instrumentations/amqplib.js

@@ -1,4 +1,5 @@
 var shimmer = require('../utils/shimmer')
+var Module = require('module')
 
 var defaults = require('lodash.defaults')
 var get = require('lodash.get')
@@ -74,32 +75,32 @@ module.exports = {
   instrumentations: [{
     path: 'amqplib',
     pre: function () {
-      require('amqplib/channel_api')
+      Module._load('amqplib/channel_api', arguments[3])
       return Array.prototype.slice.call(arguments, 2)
     }
   }, {
     path: 'amqplib/channel_api',
     pre: function () {
-      require('amqplib/lib/channel_model')
+      Module._load('amqplib/lib/channel_model', arguments[3])
       return Array.prototype.slice.call(arguments, 2)
     }
   }, {
     path: 'amqplib/callback_api',
     pre: function () {
-      require('amqplib/lib/callback_model')
+      Module._load('amqplib/lib/callback_model', arguments[3])
       return Array.prototype.slice.call(arguments, 2)
     }
   }, {
     path: 'amqplib/lib/channel_model',
     pre: function () {
-      require('amqplib/lib/connection')
+      Module._load('amqplib/lib/connection', arguments[3])
       return Array.prototype.slice.call(arguments, 2)
     },
     post: channelModelWrapper
   }, {
     path: 'amqplib/lib/callback_model',
     pre: function () {
-      require('amqplib/lib/connection')
+      Module._load('amqplib/lib/connection', arguments[3])
       return Array.prototype.slice.call(arguments, 2)
     },
     post: callbackModelWrapper