Add test list options.

- Run count
- Halt on failure
- Preserve only certain autotest logs

BUG=None
TEST=Manual

Change-Id: I25d288edbf2ebcbb0d502d348ebfd9dd31abcddd
Reviewed-on: https://gerrit.chromium.org/gerrit/20644
Reviewed-by: Jon Salz <jsalz@chromium.org>
Tested-by: Jon Salz <jsalz@chromium.org>
2 files changed