Update sync-kubevirtci sha calculation
Update sync-kubevirtci sha calculation

Use relative path, so the result would be the same on
each machine.

Signed-off-by: Or Shoval <7299abc34af50659adafa6d252dc9c537bb5cf36@redhat.com>

stu-gott/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt