cvetriager: modified access to remote branches of stable repos

Changed access to remote branches in order to for do_pull in common.py
to execute properly.

BUG=chromium:1093363
TEST=python setup.py test

Change-Id: I3c33229f8ab93c54eec4e347613009a793f09be3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2304696
Commit-Queue: Wanda Mora <morawand@chromium.org>
Tested-by: Wanda Mora <morawand@chromium.org>
Reviewed-by: Zubin Mithra <zsm@chromium.org>
3 files changed