subnet connected to router

[DeWayne Filppi]

In the ARIA usage of the plugin, I need to pass openstack_config explicitly
to every operation.  Since the relationships are implicit, how do I
accomplish this?  Currently I get errors when trying to connect a subnet to
a router.   I've tried overriding the relationship like so:

    subnet:
      type: aria.openstack.nodes.Subnet
      properties:
        resource_id: aria_helloworld_subnet
        create_if_missing: true
      interfaces:
        Standard:
          create:
            inputs:
              openstack_config: { get_input: openstack_config }
      requirements:
        - router:
            node: router
            relationship:
              type: aria.openstack.subnet_connected_to_router
              interfaces:
                Configure:
                  add_target:
                    inputs: { get_input: openstack_config }
        - network: network

Note the router requirement.  Does this syntax look correct?  Spoiler:
openstack_config never makes it to the plugin.

DeWayne