Revert "Lazy-load CLS module"

server/current-context.js

@@ -5,20 +5,9 @@
 
 'use strict';
 
+var cls = require('continuation-local-storage');
 var domain = require('domain');
 
-// Require CLS only when using the current context feature.
-// As soon as this require is done, all the instrumentation/patching
-// of async-listener is fired which is not ideal.
-//
-// Some users observed stack overflows due to promise instrumentation
-// and other people have seen similar things:
-//   https://github.com/othiym23/async-listener/issues/57
-// It all goes away when instrumentation is disabled.
-var cls = function() {
-  return require('continuation-local-storage');
-};
-
 var LoopBackContext = module.exports;
 
 /**
@@ -85,7 +74,7 @@ LoopBackContext.createContext = function(scopeName) {
   process.context = process.context || {};
   var ns = process.context[scopeName];
   if (!ns) {
-    ns = cls().createNamespace(scopeName);
+    ns = cls.createNamespace(scopeName);
     process.context[scopeName] = ns;
     // Set up LoopBackContext.getCurrentContext()
     LoopBackContext.getCurrentContext = function() {