cli: Fix import paths to use cli/cros.

As part of the Brillo entry point, we're restructuring chromite/cros to
chromite/cli/cros instead. This CL just fixes module import paths to
point to the new location to make the restructuring functional.

See brbug.com/557 for more info.

BUG=brillo:557
TEST=cbuildbot/run_tests

Change-Id: I70c783f40e207090c5babf7ac149543613c8817e
Reviewed-on: https://chromium-review.googlesource.com/261183
Reviewed-by: David Pursell <dpursell@chromium.org>
Commit-Queue: David Pursell <dpursell@chromium.org>
Trybot-Ready: David Pursell <dpursell@chromium.org>
Tested-by: David Pursell <dpursell@chromium.org>
diff --git a/scripts/test_image_unittest.py b/scripts/test_image_unittest.py
index b431d2e..edddd72 100644
--- a/scripts/test_image_unittest.py
+++ b/scripts/test_image_unittest.py
@@ -11,9 +11,9 @@
 import unittest
 
 from chromite.cbuildbot import constants
-from chromite.cros.tests import image_test
 from chromite.lib import cros_build_lib
 from chromite.lib import cros_test_lib
+from chromite.lib import image_test
 from chromite.lib import osutils
 from chromite.scripts import test_image