async_wrap: make uid the first argument in init

All other hooks have uid as the first argument, this makes it concistent
for all hooks.

Ref: https://github.com/nodejs/node/pull/7048
PR-URL: #4600
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

src/async-wrap-inl.h

@@ -40,8 +40,8 @@ inline AsyncWrap::AsyncWrap(Environment* env,
   v8::HandleScope scope(env->isolate());
 
   v8::Local<v8::Value> argv[] = {
-    v8::Int32::New(env->isolate(), provider),
     v8::Integer::New(env->isolate(), get_uid()),
+    v8::Int32::New(env->isolate(), provider),
     Null(env->isolate())
   };
 

test/parallel/test-async-wrap-check-providers.js

@@ -29,8 +29,8 @@ if (common.isAix) {
   }
 }
 
-function init(id) {
-  keyList = keyList.filter((e) => e != pkeys[id]);
+function init(id, provider) {
+  keyList = keyList.filter((e) => e != pkeys[provider]);
 }
 
 function noop() { }

test/parallel/test-async-wrap-disabled-propagate-parent.js

@@ -9,7 +9,7 @@ const providers = Object.keys(async_wrap.Providers);
 let cntr = 0;
 let client;
 
-function init(type, id, parent) {
+function init(id, type, parent) {
   if (parent) {
     cntr++;
     // Cannot assert in init callback or will abort.

test/parallel/test-async-wrap-propagate-parent.js

@@ -8,7 +8,7 @@ const async_wrap = process.binding('async_wrap');
 let cntr = 0;
 let client;
 
-function init(type, id, parent) {
+function init(id, type, parent) {
   if (parent) {
     cntr++;
     // Cannot assert in init callback or will abort.

test/parallel/test-async-wrap-uid.js

@@ -9,7 +9,7 @@ const storage = new Map();
 async_wrap.setupHooks(init, pre, post, destroy);
 async_wrap.enable();
 
-function init(provider, uid) {
+function init(uid) {
   storage.set(uid, {
     init: true,
     pre: false,