Code review comment for ~raharper/cloud-init:fix/lp-1750884-netplan-global-dns

Thank you for your merge proposal.

Your branch has been set to 'Work in progress'.
Please set the branch back to 'Needs Review' after resolving the issues below.

Thanks again,
Your friendly neighborhood cloud-init robot.

Please fix the following issues:
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Commit message lints:
 - Line #4 has 3 too many characters. Line starts with: "netplan. To handle this"...
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For more information, see commit message guidelines at
https://cloudinit.readthedocs.io/en/latest/topics/hacking.html#do-these-things-for-each-feature-or-bug