UI Test / AWTRobotUtil: Relax and fix focus tests

- toFront*(..) uses the AWT Window focus state, instead of our AWTWindowFocusAdapter,
  which removes false negatives.
  Often the focus is already hold on the Window where no focus change
  will be recognized by our AWTWindowFocusAdapter.

- assertRequestFocusAndWait(..) recovers from lack of focus-lost event
  (if received focus-gained) and only dumps the case - returns success.

- Since assertRequestFocusAndWait(..) implicitly tests the passed
  FocusAdapter and relaxes the constraints (see above)
  no more post-call assertions on the FocusAdapter is being performed (removed).

- assertRequestFocusAndWait(..) is no more used on AWT Window or Frame,
  see 1st note above!

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