Splash screen should be displayed only when user logs in to CDAP

The orange splash screen is currently displayed every time the user navigate to CDAP from another app.

• The screen should be displayed only when the user logs in / logs back in to the app.

• Once the user dismisses it (by clicking the close icon, the screen should not be displayed again until the user logs into the app again.

• If the user selects "Don't show this again" the splash screen is not shown again.