pkg/visitors: repack must set valid flag in created file
pkg/visitors: repack must set valid flag in created file

The created VolumeImageFile must have the State set as valid.
note: This was done by assemble prior to #263

Signed-off-by: Julien Viard de Galbert <b0ac616c5b7e1d49c789520b861d734956e7cb46@itrenew.com>

linuxboot/fiano