Is changed (#427)

* Refactor tests to use "is" and "is not" changed

* Refactor tests to use is succeeded or is failed

* Reformat indentation

* Add filter "bool" to prevent issues

tests/integration/targets/test_mysql_variables/tasks/assert_fail_msg.yml

@@ -22,4 +22,4 @@
 - name: assert message failure (expect failed=true)
   assert:
     that:
-      - "output.failed | bool == true"
+      - output is failed

tests/integration/targets/test_mysql_variables/tasks/assert_var.yml

@@ -31,6 +31,6 @@
 - name: assert output mysql variable name and value
   assert:
     that:
-      - "result.changed | bool == true"
+      - result is changed
       - "'{{ var_name }}' in result.stdout"
       - "'{{ var_value }}' in result.stdout"

tests/integration/targets/test_mysql_variables/tasks/assert_var_output.yml

@@ -35,6 +35,6 @@
 - name: assert output variable info match mysql variable info
   assert:
     that:
-      - "result.changed | bool == true"
+      - result is changed
       - "key_name in result.stdout"
       - "key_value in result.stdout"