Update firewall rules for firewalld

[laszlojau]

Modify firewall rules based on #323, which seems to be abandoned.

Changes

• Add ports used for cross-node communication to the internal firewalld zone
• Add node IPs to the internal firewalld zone

Linked Issues

Partially fixes #321

[dereknola]

Hi @laszlojau, thanks for picking up the dropped PR. In order to comply with the DCO, all your commits must be signed. Please follow https://github.com/k3s-io/k3s-ansible/pull/329/checks?check_run_id=25455385145.