add support for fixed ports in integration tests

[benfleis]

When integration tests don't work, it's often very handy to run tcap in a side window to watch protocol. Doing this with random ports is very annoying, thus I have a diff that used to work for fixing ports within the tests themselves.

fixed_ports.txt

Want to come back to this soon, or perhaps @CorgiMan can see easily whether it still works?

[motiejus]

Initially, I had the same problem, but later realized that I can match on a range of ports:

tcap -i lo0 -p 1024-65535

That works well for me. Would it for you?

cc @CorgiMan , what are your thoughts?

[CorgiMan]

I never encountered this problem but I like that tcap. If you get a lot of noise we can limit the range that ringpop chooses its random port from so that you can run tcap -i lo0 -p 5000-6000.