Handle more config changes and handle onDestroy

- The PrintActivity has to handle all config changes to not loose track
  close the connection to the printing app
- In the case where onDestroy is called we need to make sure to
  - not do any more UI operation
  - on async calls after destroy is already called, handle failure to
    unbind services.

Change-Id: If21335543fbfa16ecfe77d1965b2e8a13dfa14b8