docs: def create_port_binding(self, port, host):
          """Enqueue port binding create"""
          if not self.get_instance_type(port):
              return
          for pb_key in self._get_binding_keys(port, host):
              pb_res = MechResource(pb_key, a_const.PORT_BINDING_RESOURCE,
                                    a_const.CREATE)
              self.provision_queue.put(pb_res)