tls: use parent handle's close callback

When closing the child TLSWrap handle - wait for the proper parent's
handle close callback invocation. `uv_close_cb` may be invoked much
later than the next libuv tick, depending on the platform.

The only platform that currently seem to defer `uv_close_cb` is Windows
XP. This behavior was not observed on other Windows systems, and is not
possible on Unixes.

Fix: https://github.com/nodejs/node/issues/2979
PR-URL: https://github.com/nodejs/node/pull/2991
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

lib/_tls_wrap.js

@@ -296,7 +296,7 @@ proxiedMethods.forEach(function(name) {
 
 tls_wrap.TLSWrap.prototype.close = function closeProxy(cb) {
   if (this._parentWrap && this._parentWrap._handle === this._parent) {
-    setImmediate(cb);
+    this._parentWrap.once('close', cb);
     return this._parentWrap.destroy();
   }
   return this._parent.close(cb);