fails:Socket#connect_nonblock using IPv4 using a STREAM socket raises Errno::EISCONN when already connected
fails:Socket#connect_nonblock using IPv4 using a STREAM socket returns 0 when already connected in exceptionless mode
fails:Socket#connect_nonblock using IPv6 using a STREAM socket raises Errno::EISCONN when already connected
fails:Socket#connect_nonblock using IPv6 using a STREAM socket returns 0 when already connected in exceptionless mode
