Fix default address

[ruck314]

Description

• refer to Fix suggested default address. Fix broken address/port lookup rogue#985
• This will avoid getting annoying messages from cyber security port scanners.
• Only open the local 127.0.0.1 (and not all network interfaces)

[ruck314]

Confirmed this works using the 10GbE RUDP co-sim example:
https://slaclab.github.io/Simple-10GbE-RUDP-KCU105-Example/HowTo/simulation.html