Fix minor bugs in python version

ls_echo.py

 if not os.path.isdir(directory):
     raise TypeError("Path " + directory + " does not represent a valid directory.")
 
-def get_directory_listing():
-    return os.listdir("/home/lily/")
-
 class ThreadedRequestHandler(SocketServer.BaseRequestHandler):
     def handle(self):
-        response = "\n".join(os.listdir("/home/lily/"))
+        response = "\n".join(os.listdir(directory))
         self.request.send(response + "\n")
 
 class ThreadedTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
     lockfile.write('%s' %(os.getpid()))
     lockfile.flush()
 
-    server = ThreadedTCPServer(("localhost", port), ThreadedRequestHandler)
+    server = ThreadedTCPServer(("0.0.0.0", port), ThreadedRequestHandler)
 
     server.serve_forever()