Remove old images

The suggestion for equivalent images are:

 * fsl-image-gui desktop like interface is similar to core-image-sato
 * fsl-image-gui Qt4 demos are better served by qt4-demo-image
 * fsl-image-gui GStreamer use and GPU examples are better serverd by
   fsl-image-multimedia and fsl-image-multimedia-full
 * fsl-image-test has equivalent one in fsl-image-machine-test but in a
   smaller image, which is way better for testing

We are doing it in a single commit so anyone wishing to revert it
locally for use and/or test can do it easily.

Change-Id: I48602b0e31eab9070771acb638829727dbfeda45
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>