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)