common: address linting issues (backport #328)

[mergify]

This commit addresses all ansible-lint issues.

---

This is an automatic backport of pull request #328 done by Mergify.

[mergify]

Cherry-pick of 41352ed has failed:

On branch mergify/bp/squid/pr-328
Your branch is up to date with 'origin/squid'.

You are currently cherry-picking commit 41352ed.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   cephadm-clients.yml
	modified:   cephadm-distribute-ssh-key.yml
	modified:   cephadm-purge-cluster.yml
	modified:   cephadm-set-container-insecure-registries.yml
	modified:   rocksdb-resharding.yml
	modified:   validate/insecure-registries.yml
	modified:   validate/preflight.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   ceph_defaults/meta/main.yml
	both modified:   cephadm-preflight.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally