spec: require SDK 3
spec: require SDK 3

SDK 4 has been renamed and is completely
incompatible with SDK 3.

Change-Id: I77de1a286d2aa8f2779aa500e6f1906ee108305a
Signed-off-by: Sandro Bonazzola <fcb014d63786651910af5db2ecc5316c668188ef@redhat.com>

oVirt/ovirt-image-uploader,oVirt/ovirt-image-uploader,oVirt/ovirt-image-uploader