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/module_utils/known_hosts.py

@@ -15,7 +15,7 @@ import os
 import hmac
 import re
 
-from ansible.module_utils.six.moves.urllib.parse import urlparse
+from urllib.parse import urlparse
 
 try:
     from hashlib import sha1