quick-provision: Remove tmpdir if postinst fails

BUG=chromium:788473
TEST=repeat 20 autotest/files/contrib/loadtest.py $DS config.json --simultaneous 100 --total 2000
Change-Id: I3968dc3dfcb2faba7739cdc6362e203bb8b6fc0c
Reviewed-on: https://chromium-review.googlesource.com/804963
Commit-Ready: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed