test_stages_unittest: delete obsolete test

Remove an old (and now failing) test that makes assertertions about
hwtest timeouts on branch waterfall.

BUG=chromium:617674
TEST=unit tests

Change-Id: I8f10216848c280d01b9f772a6c42677a3507cca8
Reviewed-on: https://chromium-review.googlesource.com/350000
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Grace Kihumba <gkihumba@chromium.org>
1 file changed