[Bug 1861460] Re: cloud-init should parse initramfs rendered netplan if present

[Joshua Powers]

The portions required for focal are in and the remaining items are
additional for cloud-init. Dropping req4focal tag.

** Tags removed: req4focal

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Title:
  cloud-init should parse initramfs rendered netplan if present

Status in cloud-init:
  In Progress
Status in Ubuntu on IBM z Systems:
  Fix Released
Status in casper package in Ubuntu:
  Fix Released

Bug description:
  initramfs-tools used to only execute klibc based networking with some
  resolvconf hooks.

  In recent releases, it has been greatly improved to use
  isc-dhcp-client instead of klibc, support vlan= key (like in
  dracut-network), bring up Z devices using chzdev, and generate netplan
  yaml from all of the above.

  Above improvements were driven in part by Oracle Cloud and in part by
  Subiquity netbooting on Z.

  Thus these days, instead of trying to reparse klibc files in
  /run/net-*, cloud-init should simply import /run/netplan/$device.yaml
  files as the ip=* provided networking information on the command line.
  I do not currently see cloud-init doing that in e.g.
  /cloudinit/net/cmdline.py

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