qtmod_test: Fix clone of all modules while testing just qtbase
qtmod_test: Fix clone of all modules while testing just qtbase

The only time that we need to clone everything is while testing
qt5.

Task-number: QTQAINFRA-299
Change-Id: I57703be476fa06f18ddc9c95b08f9b5a2b49b656
Reviewed-on: http://codereview.qt.nokia.com/3882
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Rohan McGovern <d75463945f40a9669160a73cef2843e56b22c602@nokia.com>

tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa