New little tool: netns_tcp_bridge

Announcing my new tool: barriers.

Obviously, it can be done (with better performance) by using kernel itself (e.g. to its counterpart process.

Example invocation: netns_tcp_bridge -l 127.0.0.1:8000 -f /proc/1234/ns/net -c 127.0.0.1:8000 -t /proc/1235/ns/net