Add tcp socket support along unix socket

[awlx]

https://github.com/haproxytech/client-native/compare/master...awlx:client-native:master

Fixes the issue in a nasty way to not be able to talk to a remote haproxy via the control socket, it would be better to have a native fix for this. Or is there a specific reason to not support this?

[mjuraga]

Currently we are only supporting unix socket so we can run client-native apps locally, as many other features rely on having access to local file-system.