bisect-kit: allocate the same host as previous when resume

BUG=None
TEST=run diagnose_cros_autotest.py; interrupt; run again

Change-Id: Iec273800d6b6ca3c40e97870fc71a1a42f65e34f
Reviewed-on: https://chromium-review.googlesource.com/1291129
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Chung-yih Wang <cywang@chromium.org>
2 files changed