It was not marked executable, and was also broken. Now updates the
CHROMEOS_RELEASE_TRACK to be testimage-channel for test images.
BUG=chromium-os:20019
TEST=Manual
Change-Id: I8741f0e21831fe3d9184ca11b73dcea96a1b01b1
Reviewed-on: http://gerrit.chromium.org/gerrit/9801
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Commit-Ready: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>