Update ipxe_cloud_config to check for packet

With to change to metal, some systems are still
looking for packet, so add both until upstream
can cut things over

roles/netbootxyz/templates/menu/boot.cfg.j2

@@ -100,6 +100,7 @@ goto clouds
 :clouds
 iseq ${ipxe_cloud_config} gce && goto gce ||
 iseq ${ipxe_cloud_config} metal && goto metal ||
+iseq ${ipxe_cloud_config} packet && goto metal ||
 goto clouds_end
 
 :gce