docs: def create_vnic_spec(device):
          """
          create device spec for existing device and the mode of edit for the vcenter to update
          :param device:
          :rtype: device spec
          """
          nic_spec = vim.vm.device.VirtualDeviceSpec()
          nic_spec.operation = vim.vm.device.VirtualDeviceSpec.Operation.edit
          nic_spec.device = device
          return nic_spec