Comment 3 for bug 1566252

Looks like issue in nailgun verify:
Whole dump : http://paste2.org/GECDEALc
Command:
                client.put_node_interfaces(
                    [{'id': node['id'],
                      'interfaces': upd_ifs}])
AB Bond section:

ipdb> pp upd_ifs[7]
{'assigned_networks': [{'id': 8, 'name': 'storage'}],
 'bond_properties': {'mode': 'active-backup'},
 'mode': 'active-backup',
 'name': 'bond1',
 'slaves': [{'name': 'enp5s0f2'}, {'name': 'enp5s0f3'}],
 'type': 'bond'}

As we can see, AB bond configuration have luck of parameter
`
    bond_properties:
      type__: "linux"
`
Otherwise, Naigun successfully apply this json, as valid.

So, moving to nailgun bug.