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.

plugins/modules/java_keystore.py

@@ -182,7 +182,6 @@ import os
 import re
 import tempfile
 
-from ansible.module_utils.six import PY2
 from ansible.module_utils.basic import AnsibleModule, missing_required_lib
 from ansible.module_utils.common.text.converters import to_bytes, to_native
 
@@ -509,8 +508,6 @@ def create_file(content):
 
 
 def hex_decode(s):
-    if PY2:
-        return s.decode('hex')
     return s.hex()