Change the builder_names of builds to schedule in chromeos_release

The builder_name of release builds are configured differently in
chromeos waterfall and chromeos_release waterfall. Change the
builder_name tag in the buildbucket request so that
buildbucket-scheduler can find the right builders to run the scheduled
builds.

BUG=chromium:755276
TEST=unit_tests

Change-Id: I4511eb785aa5c60abf3daf592ebff78231c88c71
Reviewed-on: https://chromium-review.googlesource.com/809949
Reviewed-by: Ningning Xia <nxia@chromium.org>
Tested-by: Ningning Xia <nxia@chromium.org>
2 files changed