Import IPv6-supported Lua5.2 compatible code from Matthew Wild's repo

Signed-off-by: Vadim A. Misbakh-Soloviov <mva@mva.name>

samples/talker.lua

@@ -0,0 +1,21 @@
+-----------------------------------------------------------------------------
+-- TCP sample: Little program to send text lines to a given host/port
+-- LuaSocket sample files
+-- Author: Diego Nehab
+-- RCS ID: $Id: talker.lua,v 1.9 2005/01/02 22:44:00 diego Exp $
+-----------------------------------------------------------------------------
+local socket = require("socket")
+host = host or "localhost"
+port = port or 8080
+if arg then
+	host = arg[1] or host
+	port = arg[2] or port
+end
+print("Attempting connection to host '" ..host.. "' and port " ..port.. "...")
+c = assert(socket.connect(host, port))
+print("Connected! Please type stuff (empty line to stop):")
+l = io.read()
+while l and l ~= "" and not e do
+	assert(c:send(l .. "\n"))
+	l = io.read()
+end