Fix crash in tst_qmltest with the new animators.

If the target of a job was deleted while it was running we need
to avoid any operations on that job.

Task-number: QTBUG-33723
Change-Id: Ia86856e7f32465f58e25c87f9c74c99b7cb0caea
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Stabilize and speed up test

Added lots of missing qWaitForWindowExposed(), and
sped up animations.

Change-Id: Ie3c5e53dc9e9770baa05fb1da3eedce80ac52d31
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>