sdk_stages_unittest: skip flaky test

BUG=chromium:554563
TEST=None

Change-Id: Ic127b2c4aeb76a9e6edaf2a15ca334cc7e06ff76
Reviewed-on: https://chromium-review.googlesource.com/312127
Commit-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: David James <davidjames@chromium.org>
1 file changed