docs: async def list_vms(self, preset):
          """
          Listing virtual machines in a given preset
  
          :arg string preset: preset name
          :return:  (Size of a preset, list of virtual machines)
  
              - first element of a tuple is a size of virtual machines in a preset
              - second element is a dict which contains all Virtual Machines, where every element of this dict looks like that:
  
                ``{ "VIRTUAL_MACHINE_ID": { "ip": "IP_ADDR", "state": "VM_STATE" }``
  
          :rtype: tuple
  
          Sample response:
              ``( 1, {'180aa486-ee46-4628-ab1c-f4554b63231': {'ip': '172.1.1.2', 'state': 'running'}} )``
          """
          vmshepherd = self.request.app.vmshepherd
          preset = vmshepherd.preset_manager.get_preset(preset)
          result_vms = {vm.id: {'ip': vm.ip[0], 'state': vm.state.value} for vm in preset.vms}
          return preset.count, result_vms