[Merge] ~alfonsosanchezbeato/network-manager:better-eth-handling into network-manager:snap-1.10

[Alfonso Sanchez-Beato]

Alfonso Sanchez-Beato has proposed merging ~alfonsosanchezbeato/network-manager:better-eth-handling into network-manager:snap-1.10.

Commit message:
* Set sensible defaults for CFLAGS
* Add option to (un)set NM as default netplan renderer
* Remove ethernet.enable setting
* Check major series version to select DNS resolver
* Fix some shellcheck warnings

Requested reviews:
  Network-manager (network-manager)

For more details, see:
https://code.launchpad.net/~alfonsosanchezbeato/network-manager/+git/network-manager/+merge/363488

* Set sensible defaults for CFLAGS
* Add option to (un)set NM as default netplan renderer
* Remove ethernet.enable setting
* Check major series version to select DNS resolver
* Fix some shellcheck warnings
-- 
Your team Network-manager is requested to review the proposed merge of ~alfonsosanchezbeato/network-manager:better-eth-handling into network-manager:snap-1.10.
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