Add US seed node hosted by duggavo

[duggavo]

Description

This PR adds a seed node hosted by me and located in the United States

Type of change

Please select the right one.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update

Which part is impacted ?

• [x] Daemon
• [ ] Wallet
• [ ] Miner
• [ ] Misc (documentation, comments, text...)

Checklist

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings