Seamicro vendor passthru implementation

The goal of this blueprint is to implement the Seamicro vendor passthru functionality and validate code by adding unittests, functional tests (tempest) for Ironic. The Seamicro vendor passthru will confirm to the Ironic VendorInterface. The Seamicro vendor passthru functionality will use the python-seamicroclient (library) to talk to the Seamicro chassis REST API.

The Seamicro vendor passthru will be implementing 3 actions initially.
1) Allow to set a vlan id for the specified NIC of a server (node) in the Seamicro chassis.

set_node_vlan_id(node, vlan_id):
     seamicroclient.set_vlan_id(node, vlan_id)
     node['properties'].update({'vlan_id': vlan_id})
     db_api.update(node)

2) Allow to create volumes from the specified Seamicro chassis storage pool and attach those volumes to any of the server (node) within that Seamicro chassis

attach_volume(node, volume_id):
     seamicroclient.attach_volume(node, volume_id)
     node['properties'].update({'volume_id': volume_id})
     db_api.update(node)

3) Allow to set boot device for the node, One of [pxe, disk].

set_boot_device(node, boot_device):
    seamicroclient.set_boot_device(node, boot_device)
    return

In the passthru method "set_node_vlan_id", the node object's "properties" will be updated with the "vlan_id" in the Ironic DB.

In the passthru method "attach_volume", the node object's "properties" will be updated with the "volume_id" in the Ironic DB.

The "vlan_id" and "volume_id" will need to be stored in node properties till the node is present in DB.

Once Ironic and SeaMicro has better cinder/neutron support, these passthru methods will be moved to neutron/cinder.