ddiskit is not working with python3

[velezd]

The example command works in python2 but not in python3 - there may be more issues.

HOME=/root/driverdisk/ python3 ddiskit/bin/ddiskit -v -p testing -C defaults.git_dir=kernel_src/.git -C spec_file.module_name=virtio_blk -C spec_file.module_version=1.0.1_dup7.4a -C spec_file.rpm_dist=el8 -C spec_file.module_version=5.14.0-4 -C spec_file.kernel_arch=x86_64 -C res_dir=ddiskit/ prepare_sources -d "drivers/block drivers/ata"
Traceback (most recent call last):
  File "ddiskit/bin/ddiskit", line 2825, in <module>
    sys.exit(main())
  File "ddiskit/bin/ddiskit", line 2800, in main
    DDiskitConfig(default_config))
  File "ddiskit/bin/ddiskit", line 2053, in parse_config
    _, discarded_args = configs.apply_args(args)
  File "ddiskit/bin/ddiskit", line 402, in apply_args
    arg = unicode(arg, encoding=encoding)
TypeError: decoding str is not supported