[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:live-server-serial-argh-focal into livecd-rootfs:ubuntu/focal

[Michael Hudson-Doyle]

Michael Hudson-Doyle has proposed merging ~mwhudson/livecd-rootfs/+git/livecd-rootfs:live-server-serial-argh-focal into livecd-rootfs:ubuntu/focal.

Commit message:
backport some system unit & cloud-init config changes from devel:

* Simplify how the subiquity client is run on the serial console in the live
  server environment, breaking a unit cycle that sometimes prevents
  subiquity from starting up at all. (LP: #1888497)
* Do not set the password for the installer user via cloud-init as subiquity
  can now do this itself. (LP: #1933523)


Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1888497 in subiquity: "Booting the install system does not always succeed, hence a remote ssh login is not always possible"
  https://bugs.launchpad.net/subiquity/+bug/1888497
  Bug #1933523 in subiquity: "Temporary installer password and key fingerprints are not printed with latest impish daily ISOs"
  https://bugs.launchpad.net/subiquity/+bug/1933523

For more details, see:
https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/406127
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~mwhudson/livecd-rootfs/+git/livecd-rootfs:live-server-serial-argh-focal into livecd-rootfs:ubuntu/focal.
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