Clean up suite_enumerator.

This fixes a bug in the default setting of the autotest_dir option.

Additionally, it removes some dead code, and cleans up some spurious
warning messages.

BUG=None
TEST=Run `site_utils/suite_enumerator.py bvt`, get a good answer

Change-Id: Id15542d384887950153d5ce619729dad9e5cfda0
Reviewed-on: https://chromium-review.googlesource.com/209453
Commit-Queue: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Alex Miller <milleral@chromium.org>
1 file changed