Merge branch 'tizen_2.2' into tizen

Merge branch 'tizen_2.2' into tizen

- clean up code
- fix to send pending request in main thread using local event. fix double delete problem.
- fix to delete _AppContext in OnApplicationTerminated, instead of OnAppWidgetDestroy.(fix tct fails)
- fix to stop ipc server in AppWidgetManagerService destructor to avoid SIGABORT
- fix problem that AppWidgetProviderManager::RequestUpdate() doesn't return E_OBJ_NOT_FOUND properly
- fix to destroy AppWidgetManagerService in OnAppTerminating(), not by std::atexit()

Change-Id: Ife2e0e01f177ce37a2c6e97eea0d1dbf41c76b76
Signed-off-by: jungmin76.park <jungmin76.park@samsung.com>