[INTERNAL][FIX] thirdparty: add missing shim for qunit-2 and sinon-4.js
[INTERNAL][FIX] thirdparty: add missing shim for qunit-2 and sinon-4.js

This allows to load those modules with UI5 module loading APIs.

Other missing modules like sinon-qunit-bridge.js, qunit-coverage.js and 
others have been left out as they don't react on an AMD loader and
either don't have any dependencies or the dependencies are versioned
(e.g. dependency to sinon/sinon-4 or qunit/qunit-2). A static set of
shims as configured in the ui5loader-autoconfig.js can't handle such
versioned dependencies. In future, applications / test files could
configure the needed shims on their own, once config() becomes a public
API.

Change-Id: Ie3aaa83d9b13d94b54907a5572188c746b6a643c

cschuff/openui5,SAP/openui5,cschuff/openui5,SAP/openui5,SAP/openui5,cschuff/openui5,SAP/openui5