[Merge] ~slyon/netplan/+git/ubuntu:slyon/upstream-fix-1874377 into ~ubuntu-core-dev/netplan/+git/ubuntu:ubuntu/master

[Lukas Märdian]

Lukas Märdian has proposed merging ~slyon/netplan/+git/ubuntu:slyon/upstream-fix-1874377 into ~ubuntu-core-dev/netplan/+git/ubuntu:ubuntu/master.

Requested reviews:
  Łukasz Zemczak (sil2100)

For more details, see:
https://code.launchpad.net/~slyon/netplan/+git/ubuntu/+merge/383210

Drop the hotfix for LP#1874377 and replace it with the upstream fix, which handles edge cases and contains tests.
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