obmc_boot_test.py changes:
obmc_boot_test.py changes:

- run_boot() using new my_run_keyword.
- Added code to save / read boot_results to preserve continuity
  across multiple related runs.

Change-Id: Ifd460ac29d6b1c602b4a781873544059cc6406ed
Signed-off-by: Michael Walsh <10404802c7de463f402c4a18638106ca1b12ef61@us.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation