The purpose of this change is to test the documentation that is
generated for comments that use QDoc's \reimp command.
This is done by adding a new virtual method to the Test class,
and a new inherited class that implements it.

Change-Id: If2367362475cc3daf31004dec43e8e15076acfb5
Reviewed-by: Levon Sargsyan <levon.sargsyan@qt.io>
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>