test/remote_test.py: Fix missing import

Change-Id: I192c33d36f43ae2df0dda509e118f2b920d561ac
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
diff --git a/test/remote_test.py b/test/remote_test.py
index 8ebc8a0..dfdc630 100644
--- a/test/remote_test.py
+++ b/test/remote_test.py
@@ -6,6 +6,7 @@
 from multiprocessing import Process, Pipe
 from pickle import dumps
 
+import six
 from six import moves
 
 from framework import VppTestCase