INCR-429 python3 compatibility

common/test/conftest.py

@@ -1,5 +1,8 @@
 """Code run by pylint before running any tests."""
 
 # Patch the xml libs before anything else.
+from __future__ import absolute_import
+
 from safe_lxml import defuse_xml_libs
+
 defuse_xml_libs()

common/test/utils.py

@@ -1,6 +1,8 @@
 """
 General testing utilities.
 """
+from __future__ import absolute_import
+
 import functools
 import sys
 from contextlib import contextmanager