Add miraclelinux support

[tSU-RooT]

Proposed Commit Message

Add miraclelinux support

Additional Context

https://www.cybertrust.co.jp/miracle-linux/
Install ISO is available from here: https://repo.dist.miraclelinux.net/miraclelinux/isos/8.4-released/x86_64/

Test Steps

tox

_____________________________________________________________ summary _____________________________________________________________
  py3: commands succeeded
  xenial-dev: commands succeeded
  flake8: commands succeeded
  pylint: commands succeeded
  congratulations :)

Checklist:

• My code follows the process laid out in the documentation
• I have updated or added any unit tests accordingly
• I have updated or added any documentation accordingly

[holmanb]

Thanks for the PR @tSU-RooT. This looks good to me.

[TheRealFalcon]

Thanks @tSU-RooT . This PR looks good.

Before we can merge, you'll need to perform a rebase. There's a merge conflict due to cloudinit/tests/test_util.py being moved to tests/unittests/test_util.py , so your changes will have to be moved there as well.

[tSU-RooT]

Thanks for reviews, I will rebase my changes.

[TheRealFalcon]

Thanks!