Figure out how to adjust net.inet.udp.maxdgram on macOS when running solminer?

[mvines]

The default udp max datagram size on macOS is usually 9216, which is too small for our usage. We tune this value for validators at

solana/scripts/tune-system.sh

Line 46 in fc180f4

sysctl_write net.inet.udp.maxdgram 65535

but this setting will not be picked up when running the solminer GUI.

Without this setting the replicator will emit continual "Message too long" WARN messages. T simulate the warnings, run sudo sysctl -w net.inet.udp.maxdgram=10000 then start the replicator. sudo sysctl -w net.inet.udp.maxdgram=65535 and restart the replicator to make the warnings go away.

Are these just warnings that are safe to ignore?
If yes, let's reduce the log level and bury them.
If no, figure out what to do about the maxdgram mismatch. Smaller datagrams or add UI to detect this condition and guide the user on how to fix it (which would require they enter their password as they sudo)

[mvines]

This issue will be fixed by #5294