Revert "Avoid using import x = require('...')"

This reverts commit 7de696a202.

Seems to have broken loading vs/nls in at least one case in insiders

src/vs/workbench/api/node/extHostTerminalService.ts

@@ -4,7 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 'use strict';
 
-import * as vscode from 'vscode';
+import vscode = require('vscode');
 import { Event, Emitter } from 'vs/base/common/event';
 import { ExtHostTerminalServiceShape, MainContext, MainThreadTerminalServiceShape, IMainContext } from './extHost.protocol';