fix(io): disconnection is not handled properly in igtl::INetwork

Description

1. Throw exceptions when igtl connections fails (timeout, network error, or mismatch in message size) instead of using nullptr.
2. Create unit test to connect server and client & test sending messages.
3. Add patched method for creating an igtlServer and closing connection to "resolve" bug from Debian old version of IGTL.

• include patched header of igtlSocket.h (sight::io::igtl::patch::igtlSocket.h) to get public access to socket descriptor
• use the descriptor in a patched version of closeSocket() to call close() after the shutdown() on linux
• create patched version of createServer() (and thus BindSocket() listenSocket()) to get rid of the VTK_HAVE_SO_REUSEADDR define to add SO_REUSEADDR option in socket

Closes #874 (closed)

How to test it?

1. io_igtlTest
2. ExIgtl x2 (one client, one server) Try this before and after this MR you will quickly see the issue.

Some results

A better error handling, server can reuse the same port after closing.