Revert "Fix network issues on startup for cloud-init"

This reverts commit 0f6344c58f.

No longer needed since we moved to Ubuntu in https://review.opendev.org/733078

Change-Id: I849b2a2b7894b8f0700fe61832a21cba3a81ef0e

manifests/function/ephemeral/secret.yaml

@@ -117,5 +117,3 @@ stringData:
     - mount --bind /mnt/vda/var/lib/docker-engine /var/lib/docker-engine
     - mkdir -p /mnt/vda/var/lib/kubelet/ /var/lib/kubelet/
     - mount --bind /mnt/vda/var/lib/kubelet/ /var/lib/kubelet/
-    - mv /etc/network/interfaces.d/50-cloud-init.cfg /etc/network/interfaces.d/50-cloud-init
-    - systemctl restart networking