Revert "autotest: move constants to common_lib"

This reverts commit a4ac7a8f67d61f8a616724f9426dbc0fce71ce69.

BUG=chromium:519353

Change-Id: Iec2873ad22b5bb90e46a9e5b323f9626a2c07d9b
Reviewed-on: https://chromium-review.googlesource.com/292347
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Commit-Queue: Hsinyu Chao <hychao@chromium.org>
Tested-by: Hsinyu Chao <hychao@chromium.org>
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Commit-Queue: Sonny Rao <sonnyrao@chromium.org>
Tested-by: Sonny Rao <sonnyrao@chromium.org>
diff --git a/client/cros/crash_test.py b/client/cros/crash_test.py
index 07717bd..38c40fa 100644
--- a/client/cros/crash_test.py
+++ b/client/cros/crash_test.py
@@ -4,10 +4,9 @@
 
 import contextlib, fcntl, logging, os, re, shutil
 
-import common, cros_logging
+import common, constants, cros_logging
 from autotest_lib.client.bin import test, utils
 from autotest_lib.client.common_lib import error
-from autotest_lib.client.common_lib.cros import constants
 
 
 class CrashTest(test.test):