cloud-init: make network config optional

anthos-gke-on-prem requires network to be configured using cloud-init
remove network dependency optional and remove by default
adding flag to make it optional
BUG=b/172390016
TEST=emerge-lakitu cloud-init
RELEASE_NOTE=None

Change-Id: Iee522bebb3e317427b65530c10580af234860e65
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/8760
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Roy Yang <royyang@google.com>
2 files changed