au_test_harness: Remove leftover code that is causing issues

This was mistakenly leftover from CL:1828293

BUG=chromium:1010372
TEST=./cros_au_test_harness.py --board=betty --type=vm  --no_graphics --verbose --target_image=/home/ahassani/trunk/images/betty/chromiumos_qemu_image.bin --test_results_root=/home/ahassani/chroot/tmp/test-me --verify_suite_name=smoke  --test_prefix=SimpleTestVerify --ssh_private_key=/home/ahassani/trunk/chromite/ssh_keys/testing_rsa

Exempt-From-Owner-Approval: The change is trivial and we want to get
paladin builders green ASAP.

Change-Id: I6856e8a49394e8b73b32f595efcd480d17aadee4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/1834746
Commit-Queue: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Jason Clinton <jclinton@chromium.org>
1 file changed