Adding support for decommissioning

The pluggable hardware manager should be able be used for decommissioning,
such as erasing disks, updating firmwares, changing BIOS settings, and
anything else specific hardware needs. This works with the agent driver
to store state in Ironic and request out of band reboots (which may be
required to make BIOS/firmware updates work).

Change-Id: Ia42a8e75d2b8887b2351de97c2137fe21a7f4041
(cherry picked from commit 5b58eac6a88693645a265ace825e3eb82c79b64c)