feat(neutron): enable trunk plugin

We want to be able to connect multiple networks to a physical port so we
will need to trunk these networks into the port and allow the server to
tag the traffic.

components/neutron/aio-values.yaml

@@ -52,10 +52,12 @@ conf:
         type_drivers: "vlan,local,understack_vxlan"
   neutron:
     DEFAULT:
+      # the 'trunk' plugin allows for us to create and configure trunk ports to allow
+      # multiple networks to be trunked into the node and let the node apply the VLAN
       # the 'network_segment_range' plugin allows us to set the allowed VNIs or VLANs
       # for a given network and let's OpenStack select one from the available pool. We
       # are also able to see which ones are used from the OpenStack API.
-      service_plugins: "l3_understack,network_segment_range"
+      service_plugins: "l3_understack,trunk,network_segment_range"
       # we don't want HA L3 routers. It's a Python value so we need to quote it in YAML.
       l3_ha: "False"
       # we aren't using availability zones so having calls attempt to add things to