[Merge] ~chad.smith/livecd-rootfs:use-cloud-cfg-d-parts into livecd-rootfs:ubuntu/master

[Chad Smith]

Chad Smith has proposed merging ~chad.smith/livecd-rootfs:use-cloud-cfg-d-parts into livecd-rootfs:ubuntu/master.

Requested reviews:
  Dan Bungert (dbungert)

For more details, see:
https://code.launchpad.net/~chad.smith/livecd-rootfs/+git/livecd-rootfs/+merge/439585


Let's migrate away from writing out a complete /etc/cloud/cloud.cfg in ubuntu-server livecd and instead inject individual config parts so the whole of /etc/cloud/cloud.cfg doesn't get outdated.

All original config behavior in liveCD is retained, but as separate config parts files to aid in
discoverability, and avoid overwriting the default /etc/cloud/cloud.cfg delivered by upstream cloud-init.

In this PR I've migrated parts of the whole cloud.cfg content into separate files to aid visibility to what the live installer actually overrides. 

Special care should be used in reviewing the last commit which creates

live-build/ubuntu-server/includes.chroot.ubuntu-server-minimal.ubuntu-server.installer/etc/cloud/cloud.cfg.d/80-installer-limit-config-modules.cfg


We need to understand the motivation for live installer environments limiting
the modules being run in ephemeral timeframe because this significantly blocks use-cases
where cloud-init userdata may want to specialize the ephemeral installer by adding packages
or apt repos, set locale early in boot write-files to the ephemeral environment etc.

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