[autotest] Disable bug autofiling for bvt-perbuild

Now that there are more tests in bvt-perbuild and also a few more known
issues, turn off the autofiling for bvt-perbuild.

BUG=chromium:575249
TEST=Test locally

Change-Id: Ic776d31fe7a590bc9e323f6788416f1fb1675d36
Reviewed-on: https://chromium-review.googlesource.com/320417
Commit-Ready: Shuqian Zhao <shuqianz@chromium.org>
Tested-by: Shuqian Zhao <shuqianz@chromium.org>
Reviewed-by: Dan Shi <dshi@google.com>
1 file changed