dreambox-image: create /etc/image-version after do_rootfs
dreambox-image: create /etc/image-version after do_rootfs

this allows us to drop tuxbox-image-version which was easily overlooked
when creating a new image thus having an old build date in /etc/image-version

demsey/openembedded,YtvwlD/od-oe,JrCs/opendreambox,JrCs/opendreambox,popazerty/openembedded-cuberevo,demsey/openenigma2,popazerty/openembedded-cuberevo,demsey/openenigma2,YtvwlD/od-oe,demsey/openenigma2,demsey/openenigma2,YtvwlD/od-oe,demsey/openembedded,popazerty/openembedded-cuberevo,demsey/openembedded,JrCs/opendreambox,demsey/openembedded,popazerty/openembedded-cuberevo,demsey/openenigma2,popazerty/openembedded-cuberevo,YtvwlD/od-oe,JrCs/opendreambox,demsey/openenigma2,popazerty/openembedded-cuberevo,JrCs/opendreambox,demsey/openembedded,JrCs/opendreambox,JrCs/opendreambox,YtvwlD/od-oe,demsey/openenigma2,JrCs/opendreambox,YtvwlD/od-oe,popazerty/openembedded-cuberevo,popazerty/openembedded-cuberevo,YtvwlD/od-oe,JrCs/opendreambox,YtvwlD/od-oe,demsey/openembedded,demsey/openembedded