caps: add time import

This was previously visible through the testutils import.
diff --git a/tests/caps.py b/tests/caps.py
index c75bd56..b87b0e2 100644
--- a/tests/caps.py
+++ b/tests/caps.py
@@ -4,7 +4,7 @@
 """
 
 import logging
-
+import time
 import unittest
 
 from oftest import config