[Merge] lp:~sil2100/livecd-rootfs/rpi3-workarounds-hook into lp:livecd-rootfs

[Łukasz Zemczak]

Łukasz Zemczak has proposed merging lp:~sil2100/livecd-rootfs/rpi3-workarounds-hook into lp:livecd-rootfs.

Commit message:
Add Michael's rpi3 hax hook officially to the ubuntu-cpc images, but only executing it for raspi3 rootfs builds.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~sil2100/livecd-rootfs/rpi3-workarounds-hook/+merge/360786

Add Michael's rpi3 hax hook officially to the ubuntu-cpc images, but only executing it for raspi3 rootfs builds.

So this is the first try on streamlining of the workarounds we need for raspi3 builds. The following could be also done as part of the existing hack for raspi2 we have in auto/config (where there's a config/hooks/999-raspi2-fixes.chroot created), but it felt to me just using the project-hook mechanism is cleaner.

Of course the best way would be to simply modify the seeds to not install grub-legacy-ec2 and install wpasupplicant, but not sure if we can do it per-subarch in there. I don't have enough knowledge to see if that's possible in any other sane way.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~sil2100/livecd-rootfs/rpi3-workarounds-hook into lp:livecd-rootfs.
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