Use :0 for loopback testing. This is more portable between testing environments.
Add testRR that calls NewRR and throws error away - apply it everywhere where needed.
It seems only Go 1.9 can deal with :0 being used. Disable 1.8 in travis.
TCP wasn't returning rrt info anymore, fix this. Also add
an issue_test.go where fixes for specific issues can be put.
Pull the rtt for udp message up into the function where we now
also set the rrt for tcp (for symmetry).
Miek Gieben
andrewtj