GlobalActions | ShutDownThread fixes [see message]
GlobalActions cleanup and fixes for Power Press reboot
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GlobalActions: Fix possible race condition when showing dialog.
Depending on the presence of a previous dialog, the newly generated one
gets either immediately displayed (no old dialog) or shortly delayed
(after dismissal of the existing one).
If a new show event happens (by rapid fire of the power key, for instance,
using a keyboard with fast-repeating events) during that delay, a new
dialog will be immediately displayed, and when the delayed show triggers
it'll conflict with it (and bring everything down).

This moves the creation of the new Dialog object to _before_ showing
it (delayed or not), instead of the show method itself, to ensure the
object isn't clobbered by competing/sequential calls to handleShow()

Change-Id: Ie4d9a8507ebaf59da31869c38b98c3c98a74468e

framework:Thread synchronization for UI update
Issue : Framework reboot was observed due to out of sync between
        two threads which inturn causes Null pointer exception
        while updating airplanemode.
Fix : Handled Null pointer exception and the crash is not observed.
CRs-Fixed: 570122

Change-Id: I2e969f6e7726ffcf8648b366ebb54cb2b0afc292

ShutDownThread cleanup missing/unreferenced changes from globalactions