Temporarily disable building test image for duck-release

BUG=chromium:348889
TEST=ran cbuildbot_view_config and compare the difference
Diff:
duck-release:
 images: [u'base', u'test'], [u'base']

Change-Id: I2a93d088adc3bf5d9f99fd5129a37c5ce48ffafe
Reviewed-on: https://chromium-review.googlesource.com/188682
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
1 file changed