kola/tests: disable coreos.network.initramfs.second-boot on oci
kola/tests: disable coreos.network.initramfs.second-boot on oci

coreos.network.initramfs.second-boot is blacklisted on OCI because
networking is required in the initramfs on every boot to mount the
root disk.

dm0-/mantle,dm0-/mantle,glevand/coreos--mantle,glevand/coreos--mantle