UDP poll_timeout should be configurable

[scw00]

See

trafficserver/iocore/net/UnixUDPNet.cc

Lines 73 to 76 in a5f145d

	PollDescriptor *upd = upc->pollDescriptor;
	// due to ET_UDP is really simple, it should sleep for a long time
	// TODO: fixed size
	upc->poll_timeout = 100;

[bryancall]

@scw00 Is this related to HTTP/3 / QUIC?

[scw00]

Yep, ats core doesn't use UDP

[bryancall]

Sounds like we should use proxy.config.net.poll_timeout