BMC code update changes

This changes addresses the following:
    - Using power setting utils for poweroff
    - Add PrepareForUpdate Method

Resolves openbmc/openbmc-test-automation#132

Change-Id: I5c09057e9e8c3895ef49097dc5ee81ae2155b0c6
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
2 files changed