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/zpool_facts.py

@@ -116,7 +116,6 @@ parsable:
 
 from collections import defaultdict
 
-from ansible.module_utils.six import iteritems
 from ansible.module_utils.basic import AnsibleModule
 
 
@@ -152,7 +151,7 @@ class ZPoolFacts(object):
 
             self._pools[pool].update({prop: value})
 
-        for k, v in iteritems(self._pools):
+        for k, v in self._pools.items():
             v.update({'name': k})
             self.facts.append(v)