This change adds support for the oneview drivers (agent, iscsi).
Note that changes on the ironic installation will occur only when
the oneview drivers are being used (agent_pxe_oneview or
iscsi_pxe_oneview are in the ironic_openstack_driver_list). This
means that this patch should not change anything on the the default
ironic installation (using agent_ipmitool driver).
Change-Id: I969df888c6a8b68e7a1a0643b46eee4b546ec13c
d3edce127d