Add missing import sys to lib/daemon.py

It does “print >> sys.stderr, …” but there is no import sys.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

lib/daemon.py

@@ -31,6 +31,7 @@ import logging
 import sched
 import time
 import socket
+import sys
 
 from ganeti import utils
 from ganeti import constants
@@ -310,4 +311,3 @@ def GenericMain(daemon_name, optionparser, dirs, check_fn, exec_fn):
     exec_fn(options, args)
   finally:
     utils.RemovePidFile(daemon_name)
-