[Merge] ~gjolly/livecd-rootfs:feat/functions/snap_validate_seed_kern_param into livecd-rootfs:ubuntu/master

[John Chittum]

Review: Approve

approved from CPC side (Gauthier and I paired through the problem). 

We see this popping up with Azure CVM image builds with it moving to the 6.2 kernel, ending up with a mismatched kernel apparmor feature set, and snaps not preseeding. 
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https://code.launchpad.net/~gjolly/livecd-rootfs/+git/livecd-rootfs/+merge/452451
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