Re-order imports to make pylint happy

Change-Id: I4c54be3f13d13558d6beed36dcc6cfccf3a19f5f
diff --git a/drivers/Dummy.py b/drivers/Dummy.py
index 7750dd5..72f31c4 100644
--- a/drivers/Dummy.py
+++ b/drivers/Dummy.py
@@ -18,10 +18,10 @@
 #  MA 02110-1301, USA.
 
 import logging
-import pexpect
 import sys
 import re
 import pickle
+import pexpect
 
 # Dummy switch driver, designed specifically for
 # testing/validation. Just remembers what it's been told and gives the