Add support for overlay2.size setting used to limit container storage usage

[mmusenbr]

• Usable when overlay2 storage is backed by an xfs filesystem with pquoata support
• https://docs.docker.com/reference/cli/dockerd/#overlay2size

Summary

Support defining overlay2.size setting, which allows restriction of storage usage per container: See Docker Reference

Checklist

• [ ] 🟢 Spec tests.
• [ ] 🟢 Acceptance tests.
• [x] Manually verified. (For example puppet apply)