update code to python3 (#10903)

* update code to python3

* add changelog frag

* rollback adjustment for plugins/lookup/lmdb_kv.py

* accept PR suggestion for plugins/module_utils/utm_utils.py

* accept PR suggestion for plugins/module_utils/vexata.py

* Apply suggestions from code review

* Update changelogs/fragments/10903-2to3.yml

* Update changelogs/fragments/10903-2to3.yml

plugins/callback/counter_enabled.py

@@ -67,7 +67,7 @@ class CallbackModule(CallbackBase):
     def v2_playbook_on_play_start(self, play):
         name = play.get_name().strip()
         if not name:
-            msg = u"play"
+            msg = "play"
         else:
             msg = f"PLAY [{name}]"