Massive adjustment in integration tests for changed and failed (#2577)

* Replaced ".changed ==" with "is [not] changed". Same for failed

* Mr Quote refused to go

tests/integration/targets/git_config/tasks/unset_no_value.yml

@@ -17,7 +17,7 @@
 - name: assert unsetting didn't change
   assert:
     that:
-      - unset_result.changed == false
+      - unset_result is not changed
       - unset_result.msg == 'no setting to unset'
       - get_result.config_value == ''
 ...