[autotest] Optionally clobber database when running setup.

This fixes setup_dev_autotest.sh not being re-entrant, and adds an
option to either drop the database or skip re-creating the database.

BUG=chromium-os:32854
TEST=run twice

Change-Id: I2d0cebce6a84682f75bd5fa44ec16b73d34c67a7
Reviewed-on: https://gerrit.chromium.org/gerrit/28981
Tested-by: Alex Miller <milleral@chromium.org>
Reviewed-by: Chris Masone <cmasone@chromium.org>
Commit-Ready: Alex Miller <milleral@chromium.org>
1 file changed