Zend\Test - set the request's requestUri to the dispatched url

When dispatching a url in a controller test (e.g. $this->dispatch('/foo');), the request's uri object's path is set to the dispatched url, but the request's requestUri is not.  It is always set to '/'.  This causes problems for any module or controller code that looks at the request's requestUri.  This pull request fixes this problem.