add sha256sum files for ipa images where to search for the offline git variables
add sha256sum files for ipa images
where to search for the offline git variables

Signed-off-by: Bernd Mueller <92077450b9044303d92f5e65cc1df76bc62504ed@b1-systems.de>
Change-Id: Icff9690321218e9fbbe6241263b3e3982f1cb3a7
Signed-off-by: Bernd Mueller <92077450b9044303d92f5e65cc1df76bc62504ed@b1-systems.de>

openstack/bifrost,openstack/bifrost