Add Rocky Linux support

[dmrub]

This is a workaround because Rocky Linux is not identified as RedHat until Ansible 2.11. https://forums.rockylinux.org/t/ansible-os-family-question/3320

[sjpb]

I'm on ansible [core 2.11.5] and I still needed this PR, else I got the following on Rocky 8.5:

TASK [cloudalchemy.prometheus : Install SELinux dependencies] *********************************************************************************************************
failed: [alaska-control] (item=libselinux-python) => {
    "ansible_loop_var": "item",
    "attempts": 5,
    "changed": false,
    "failures": [
        "libselinux-python All matches were filtered out by modular filtering for argument: libselinux-python"
    ],
    "item": "libselinux-python",
    "rc": 1,
    "results": []
}

MSG:

Failed to install some of the specified packages

Maybe the package names have changed from libselinux-python to python3-libselinux from 8.x to 8.5??

I don't understand the CI lint failure but this PR works for me.

[sjpb]

This should be fixed already for all RHEL clones in master by aa95978755345097effca886bf116dace739d31b

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[SuperQ]

This role has been deprecated in favor of a the prometheus-community/ansible collection.