nvmetcli is not compatible with Python 3.10

[xypron]

sudo ./nvmetcli restore test.json

Traceback (most recent call last):
  File "nvmetcli/./nvmetcli", line 617, in <module>
    main()
  File "nvmetcli/./nvmetcli", line 600, in main
    funcs[sys.argv[1]](savefile)
  File "nvmetcli/./nvmetcli", line 563, in restore
    errors = nvme.Root().restore_from_file(from_file)
  File "nvmetcli/nvmet/nvme.py", line 380, in restore_from_file
    return self.restore(config, clear_existing=clear_existing,
  File "nvmetcli/nvmet/nvme.py", line 355, in restore
    Subsystem.setup(t, err_func)
  File "nvmetcli/nvmet/nvme.py", line 496, in setup
    Namespace.setup(s, ns, err_func)
  File "nvmetcli/nvmet/nvme.py", line 590, in setup
    ns._setup_attrs(n, err_func)
  File "nvmetcli/nvmet/nvme.py", line 222, in _setup_attrs
    for name, value in attr_dict.get(group, {}).iteritems():
AttributeError: 'dict' object has no attribute 'iteritems'