fix: maintain udp conn direction to fix possible dns leaking

[mzz2017]

Background

In the past (bug brought by #493), the direction of the UDP connection was not maintained, so receiving a return packet would cause all subsequent packets of the same five-tuple to be sent directly, which is not in line with expectations. This PR will fix it.

Checklist

• [ ] The Pull Request has been fully tested
• [ ] There's an entry in the CHANGELOGS
• [ ] There is a user-facing docs PR against https://github.com/daeuniverse/dae

Full Changelogs

• [Implement ...]

Issue Reference

Closes #[issue number]

Test Result