Add Oracle Linux signature check to osimage
Add Oracle Linux signature check to osimage

Oracle Linux was being misidenntified as RHEL,
fix so that oracle linux is treated differently.

jjohnson42/confluent,xcat2/confluent,jjohnson42/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,xcat2/confluent,jjohnson42/confluent,xcat2/confluent