Implements the DRAC ManagementInterface for get/set boot device

What it says. The get_sensors_data() won't be implemented as part of
this patch because it's outside the scope of the blueprint.

Co-Authored-By: Imre Farkas <ifarkas@redhat.com>
Implements blueprint drac-management-driver
Change-Id: I9cae3156b6af016bfbf64cb3c117fdec8536f714
Merge "Implements the DRAC ManagementInterface for get/set boot device"