cros_update: Migrate to chromite

This is mostly uses the cros_update files in the chromite.

BUG=chromium:1003986
TEST=./devserver_integration_test.py

Cq-Depend: chromium:1866027
Change-Id: Id9c3f6e4c6b8e08889ec96942f37f3e084380e9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/1894676
Tested-by: Amin Hassani <ahassani@chromium.org>
Tested-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/devserver_integration_test.py b/devserver_integration_test.py
index 502da78..c1cca8c 100755
--- a/devserver_integration_test.py
+++ b/devserver_integration_test.py
@@ -33,10 +33,9 @@
 
 import psutil  # pylint: disable=import-error
 
-import cros_update_progress
-
 import setup_chromite  # pylint: disable=unused-import
 from chromite.lib import cros_logging as logging
+from chromite.lib import cros_update_progress
 from chromite.lib.xbuddy import devserver_constants