Rename chromite.buildbot -> chromite.cbuildbot.

BUG=None
TEST=None
CQ-DEPEND=CL:199664

Change-Id: Ic24efba21299c0617c2e24001fa96b6682f292bd
Reviewed-on: https://chromium-review.googlesource.com/200157
Reviewed-by: David James <davidjames@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
diff --git a/au_test_harness/vm_au_worker.py b/au_test_harness/vm_au_worker.py
index 8dc51c1..fa22a04 100644
--- a/au_test_harness/vm_au_worker.py
+++ b/au_test_harness/vm_au_worker.py
@@ -9,7 +9,7 @@
 import tempfile
 
 import constants
-from chromite.buildbot import constants as buildbot_constants
+from chromite.cbuildbot import constants as buildbot_constants
 from chromite.lib import cros_build_lib
 from crostestutils.au_test_harness import au_worker
 from crostestutils.au_test_harness import update_exception