[Merge] ~danilogondolfo/netplan/+git/ubuntu:fix_wg_keyfile_parsing into ~ubuntu-core-dev/netplan/+git/ubuntu:ubuntu-mantic

[Lukas Märdian]

Review: Approve

LGTM, other than adding the bug reference to the changelog: "(LP: #2021884)". Which I did fixup.

I will be incorporating this into my next Debian upload which should become a sync into Ubuntu.
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https://code.launchpad.net/~danilogondolfo/netplan/+git/ubuntu/+merge/444864
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