fix print format for python3
@ -1,4 +1,4 @@
#!/usr/bin/env python2.7
#!/usr/bin/env python
# Copyright 2017 gRPC authors.
#
@ -27,4 +27,4 @@ import python_utils.start_port_server as start_port_server
start_port_server.start_port_server()
print "Port server started successfully"
print("Port server started successfully")