net/bird3: Update rc script
Address some fixes:
- Modify rcorder to start sooner, enabling other daemons that rely on network access to start correctly.
- Introduce gracefulrestart as an additional rc command.
PR: 282565
PR: 240732
Sponsored by: Netflix
(cherry picked from commit 1372a98ed6e303763de9f4a6bd6c6011fb3b66bd)