Fix eos integration test failure (#42188)

* Fix error message in eos_config integration test
* Fix set_become invoke login in httpapi connection plugin

test/integration/targets/eos_config/tests/cli/check_mode.yaml

@@ -17,7 +17,7 @@
    that:
    - "result.msg is defined"
    - "result.failed == true"
-   - "'Error on executing commands' in result.msg"
+   - "'Invalid input' in result.msg"
 
 - name: valid configuration in check mode
   eos_config: