iptest: Add TCP echo client support
Add the possibility to use a TCP connection for the echo client. The code is well prepared for this and you simply need to activate the correct parameter parsing and connect the socket to the server.
A simple test using iptest -g 192.168.1.100 -n1 -a
worked, using iptest -g 192.168.1.100 -n3 -a
throw an error.
Not sure why.