fixing disconnect when LIBVIRT_KEEPALIVE is defined

vmdriver.py

-#!/usr/bin/env python
-
 import libvirt
 import logging
 import os
@@ -69,12 +67,15 @@ def disconnect():
     '''Disconnect from the active libvirt daemon connection.
     '''
     global connection
+    if os.getenv('LIBVIRT_KEEPALIVE') is None:
         if connection is None:
             logging.debug('There is no available libvirt conection.')
         else:
             connection.close()
             logging.debug('Connection closed to libvirt.')
             connection = None
+    else:
+        logging.debug('Keepalive connection should not close.')
 
 
 @celery.task