Today, the driver_netio test client binds a new socket to a specific network port. This triggers a firewall alert on Windows 7, and the alert UI window may interfere with user32:msg tests.
Fix this by binding to a dynamically-allocated port instead.
Related: - https://bugs.winehq.org/show_bug.cgi?id=53891 - https://bugs.winehq.org/show_bug.cgi?id=54202