Public bug reported:

[Impact]

In eoan we switched the datasource configuration from shipping the
NoCloud config on the rootfs to actually doing that in the system-boot
boot partition. For our images to be consistent throughout various
supported series, those changes should be backported to bionic. Also,
since we basically use one gadget tree for all the series, we'd want the
bionic parts up-to-date in case we introduce breaking changes in the
gadget.

[Test Case]

1. Image build test.
 * Start a bionic-proposed classic raspi3 build
 * Make sure the build succeeds

2. Test if datasource is correct.
 * Boot up the newly built raspi3 image
 * Make sure that you can log in with the usual default ubuntu/ubuntu user
 * Check that the boot partition (as mounted in /boot/firmware) has the 
user-data file

3. Check if raspi2 did not regress.
 * Start a bionic-proposed raspi2 build
 * Make sure the build succeeds
 * Boot the image
 * Make sure you can correctly log in with the default ubuntu/ubuntu user

[Regression Potential]

There is a minimal regression potential related to this upload as we are
introducing a small delta from what we have in eoan. In eoan we stopped
building raspi2 images completely, but for bionic this 'variant' is
still supported, so first regression potential I see is in breaking the
default user configuration for those images. Other regression potential
might be all related to the 999-cpc-fixes hook, in case some
configuration is not skipped for certain architectures.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Medium
     Assignee: Łukasz Zemczak (sil2100)
         Status: Fix Released

** Affects: livecd-rootfs (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Łukasz Zemczak (sil2100)
         Status: In Progress

** Also affects: livecd-rootfs (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu Bionic)
     Assignee: (unassigned) => Łukasz Zemczak (sil2100)

** Changed in: livecd-rootfs (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: livecd-rootfs (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1849472

Title:
  Bionic raspi3 images should have the same cloud-init datasource setup
  as eoan

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