nxos integration fix part 1 (#27069)

* Assorted Python 3 fixes

* Fix `testcase` definition in integration tests

* Fix nxos_acl_interface

* clean up nxapi after nxos_nxapi

lib/ansible/plugins/action/nxos_config.py

@@ -41,7 +41,7 @@ class ActionModule(_ActionModule):
             try:
                 self._handle_template()
             except ValueError as exc:
-                return dict(failed=True, msg=exc.message)
+                return dict(failed=True, msg=str(exc))
 
         result = super(ActionModule, self).run(tmp, task_vars)
 
@@ -55,7 +55,7 @@ class ActionModule(_ActionModule):
 
         # strip out any keys that have two leading and two trailing
         # underscore characters
-        for key in result.keys():
+        for key in list(result.keys()):
             if PRIVATE_KEYS_RE.match(key):
                 del result[key]