Fix error name 'raw_input' is not defined (for Python3)

supervisor/supervisorctl.py

@@ -33,6 +33,7 @@ import threading
 from supervisor.compat import xmlrpclib
 from supervisor.compat import urlparse
 from supervisor.compat import unicode
+from supervisor.compat import raw_input
 
 from supervisor.medusa import asyncore_25 as asyncore