Remove all usage of ansible.module_utils.six from main branch (#10888)

* Get rid of all six.moves imports.

* Get rid of iteritems.

* Get rid of *_type(s) aliases.

* Replace StringIO import.

* Get rid of PY2/PY3 constants.

* Get rid of raise_from.

* Get rid of python_2_unicode_compatible.

* Clean up global six imports.

* Remove all usage of ansible.module_utils.six.

* Linting.

* Fix xml module.

* Docs adjustments.

tests/unit/plugins/lookup/test_bitwarden.py

@@ -9,7 +9,6 @@ from ansible_collections.community.internal_test_tools.tests.unit.compat import
 from ansible_collections.community.internal_test_tools.tests.unit.compat.mock import patch
 
 from ansible.errors import AnsibleError
-from ansible.module_utils import six
 from ansible.plugins.loader import lookup_loader
 from ansible_collections.community.general.plugins.lookup.bitwarden import Bitwarden, BitwardenException
 from ansible.parsing.ajson import AnsibleJSONEncoder
@@ -240,7 +239,7 @@ class TestLookupModule(unittest.TestCase):
         # Entry 0, "a_test" of the test input should have no duplicates.
         record = MOCK_RECORDS[0]
         record_name = record['name']
-        for k, v in six.iteritems(record['login']):
+        for k, v in record['login'].items():
             self.assertEqual([v],
                              self.lookup.run([record_name], field=k)[0])