Command to list firmware components of a node:
* ``openstack baremetal node firmware list <node_ident>``
The `firmware_interface` can be specified in the commands below:
* ``openstack baremetal node create``
* ``openstack baremetal node show``
* ``openstack baremetal node set``
* ``openstack baremetal node unset``
* ``openstack baremetal driver list``
* ``openstack baremetal driver show``
Bumping API to match the required version for it and added unit testing.
Change-Id: I90146439768444a92a586cb96c5ab1fca9899653