Fix up self-test code

switch_restart closes the connection itself

Change-Id: I6eb045a211ea06be99064eafec497c891a0770cf
diff --git a/drivers/CiscoSX300.py b/drivers/CiscoSX300.py
index c875ca6..cd50ea4 100644
--- a/drivers/CiscoSX300.py
+++ b/drivers/CiscoSX300.py
@@ -517,6 +517,6 @@
     print 'Restarting switch, to explicitly reset config'
     p.switch_restart()
 
-    p.switch_disconnect()
+#    p.switch_save_running_config()
 #    p._show_config()