QtIFW

Move the restart of the wizard into installer base.

Also clear some more labels on restart or after new setings.

Change-Id: I3a3727b0d4f2f43e13aafa5f6e499ac74277774c
Reviewed-by: Niels Weber <niels.2.weber@nokia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>