fix: set accept_ra=2 to fix missing ipv6 address on WAN interface if necessary

[mzz2017]

Background

bindLan setting conf.ipv6.all.forwarding=1 suppresses accept_ra=1, thus we set it 2 as a workaround. See https://sysctl-explorer.net/net/ipv6/accept_ra/ for more information.

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 #463

Test Result

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