[Merge] ~paelzer/ubuntu-seeds/+git/ubuntu:pmdk-extra-exclude-2 into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:focal

[Christian Ehrhardt ]

Rebased for another change that landed and pushed.
Thanks for the check Andreas.
-- 
https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/ubuntu/+merge/378569
Your team Ubuntu Core Development Team is subscribed to branch ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:focal.