bisect-kit: show lab host status counter

With showing status counter, it's easier to know the reason why
allocation failed.

BUG=None
TEST=run diagnose_cros_autotest.py with --dut :lab:

Change-Id: Iac5d33635180cc2e586a7ddbc43337a80943e450
Reviewed-on: https://chromium-review.googlesource.com/1278507
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Chung-yih Wang <cywang@chromium.org>
1 file changed