fw_dut_info: add utility (and dutio package)

This is an incremental step for migration of functionality from
crostestutils/provingground/firmware/dut.sh.  This moves ssh related
functionality out of fw_lab_triage_helper into a new dutio package in
order to make it accessible to dut_info.

TEST=Ran fw_dut_info and fw_lab_triage_helper and inspected output
(triage helper has another independent problem preventing getting
to the ssh part, but it built cleanly).

Change-Id: I0c0533223991969abb62d29c62f7bf74511a6a08
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/2062666
Reviewed-by: Greg Edelston <gredelston@google.com>
Commit-Queue: Kevin Shelton <kmshelton@chromium.org>
Tested-by: Kevin Shelton <kmshelton@chromium.org>
4 files changed