Rocky Linux support

[ooraini]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Add Rocky Linux in the list of know OSs and containerd supported OSs
Which issue(s) this PR fixes:

Fixes #7596

Special notes for your reviewer:
I had to run it with -e maximal_ansible_version=2.12.0, there is PR for raising maximal_ansible_version. For the ansible_distribution to be properly set to 'Rocky', Ansible 2.11 is required.
Does this PR introduce a user-facing change?:

Add support for Rocky Linux

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[floryut]

Nice, if those are the only place where tweaks are needed that's awesome
/ok-to-test

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, ooraini

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[oomichi]

/lgtm