Replace backticks with repr() or "%r"

From SF patch #852334.
diff --git a/Demo/sockets/telnet.py b/Demo/sockets/telnet.py
index ee7c43b..d86cbeb 100755
--- a/Demo/sockets/telnet.py
+++ b/Demo/sockets/telnet.py
@@ -53,7 +53,7 @@
 	try:
 		s.connect((host, port))
 	except error, msg:
-		sys.stderr.write('connect failed: ' + `msg` + '\n')
+		sys.stderr.write('connect failed: ' + repr(msg) + '\n')
 		sys.exit(1)
 	#
 	pid = posix.fork()