Use new hardening role

[jsf9k]

🗣 Description

This pull requests switches to the new cisagov/ansible-role-hardening-2 that @bra1ncramp created.

💭 Motivation and context

The new hardening role takes care of some security findings that were identified by the security team.

🧪 Testing

All automated tests pass. I also built and deployed a new AMI with these changes for our staging COOL environment. I was able to verify that the new AMI still functions as intended.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All new and existing tests pass.
• Build and test a new staging AMI with these changes.

✅ Pre-merge checklist

• Revert to the default branch of cisagov/ansible-role-hardening-2 once Update konstruktoid/ansible-role-hardening for cisagov's needs ansible-role-hardening-2#1 is merged.
• Finalize version.

✅ Post-merge checklist

• Create a release.

[jsf9k]

I verified that using these changes results in an OpenVPN AMI that functions as expected

[dav3r]

👍 👍