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

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

samples/listener.lua

@@ -0,0 +1,26 @@
+-----------------------------------------------------------------------------
+-- TCP sample: Little program to dump lines received at a given port
+-- LuaSocket sample files
+-- Author: Diego Nehab
+-- RCS ID: $Id: listener.lua,v 1.11 2005/01/02 22:44:00 diego Exp $
+-----------------------------------------------------------------------------
+local socket = require("socket")
+host = host or "*"
+port = port or 8080
+if arg then
+	host = arg[1] or host
+	port = arg[2] or port
+end
+print("Binding to host '" ..host.. "' and port " ..port.. "...")
+s = assert(socket.bind(host, port))
+i, p   = s:getsockname()
+assert(i, p)
+print("Waiting connection from talker on " .. i .. ":" .. p .. "...")
+c = assert(s:accept())
+print("Connected. Here is the stuff:")
+l, e = c:receive()
+while not e do
+	print(l)
+	l, e = c:receive()
+end
+print(e)