[autotest] Slight improvement to debug options for lab_inventory

This renames the --print option to --debug, and allows for testing
the individual --board-summary and --pool-summary (instead of always
executing both options when --debug is present).

BUG=None
TEST=unit tests

Change-Id: If4068f56bbb03833d1005207d7a1f73fb0b82f0b
Reviewed-on: https://chromium-review.googlesource.com/305584
Commit-Ready: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
2 files changed