[Merge] ~slyon/network-manager:netplan-integration into network-manager:ubuntu/master

[Lukas Märdian]

I've just pushed another update to the branch, which handles migration failures gracefully:
Before migration it will create a temporary backup of the keyfile in and restore that keyfile backup, should the migration fail.

We're working on the crash (libnetplan bug) separately, as mentioned above. I've pushed the current state of this branch into the "Netplan Everywhere" PPA via https://code.launchpad.net/~canonical-foundations/+recipe/network-manager-netplan-lunar-gu

Let me know what you think!
-- 
https://code.launchpad.net/~slyon/network-manager/+git/network-manager/+merge/423735
Your team Network-manager is requested to review the proposed merge of ~slyon/network-manager:netplan-integration into network-manager:ubuntu/master.