sepolicy test fails with Python-3.9

sepolicy test fails with Python-3.9

[Petr Lautrbach]

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https://jenkins-continuous-infra.apps.ci.centos.org/job/fedora-rawhide-pr-pipeline/3747/artifact/package-tests/logs/FAIL-upstream-err.log

Verify sepolicy interface -c -i works ... Traceback (most recent call last):
  File "/usr/bin/sepolicy", line 691, in <module>
    args = parser.parse_args(args=parser_args)
  File "/usr/lib64/python3.9/argparse.py", line 1819, in parse_args
    args, argv = self.parse_known_args(args, namespace)
  File "/usr/lib64/python3.9/argparse.py", line 1852, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/usr/lib64/python3.9/argparse.py", line 2043, in _parse_known_args
    positionals_end_index = consume_positionals(start_index)
  File "/usr/lib64/python3.9/argparse.py", line 2020, in consume_positionals
    take_action(action, args)
  File "/usr/lib64/python3.9/argparse.py", line 1929, in take_action
    action(self, namespace, argument_values, option_string)
  File "/usr/lib64/python3.9/argparse.py", line 1208, in __call__
    subnamespace, arg_strings = parser.parse_known_args(arg_strings, None)
  File "/usr/lib64/python3.9/argparse.py", line 1852, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/usr/lib64/python3.9/argparse.py", line 2061, in _parse_known_args
    start_index = consume_optional(start_index)
  File "/usr/lib64/python3.9/argparse.py", line 2001, in consume_optional
    take_action(action, args, option_string)
  File "/usr/lib64/python3.9/argparse.py", line 1929, in take_action
    action(self, namespace, argument_values, option_string)
  File "/usr/bin/sepolicy", line 216, in __call__
    interface_dict = get_interface_dict()
  File "/usr/lib/python3.9/site-packages/sepolicy/interface.py", line 149, in get_interface_dict
    for i in m.getiterator('interface'):
AttributeError: 'xml.etree.ElementTree.Element' object has no attribute 'getiterator'

According to
https://docs.python.org/3.8/library/xml.etree.elementtree.html#xml.etree.ElementTree.Element
xml.etree.ElementTree.Element.getiterator is "deprecated since version 3.2, will
be removed in version 3.9"

I'll prepare a patch with fix.

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