Bug 1102185 - [FFOS2.0][Woodduck][STK]There has no terminal response when execute "setup call ->cancel".

PR for bug 1102185 
- Clear the event of onVisibilityChange when any option is clicked.
- Redirect visibilityChange of Settings to System app. System app handles the event is a better strategy.
- Add test case to handle on visibility change event from Settings app.
nit: Now all dom requests are then-able. I would suggest to use a promise.