Add integration test that modules are loaded from the expected locations (#24170)

* Add integration test that modules are loaded from the expected locations
* Fix ping module to pass PEP8

lib/ansible/modules/system/ping.py

@@ -48,6 +48,7 @@ ansible webservers -m ping
 
 from ansible.module_utils.basic import AnsibleModule
 
+
 def main():
     module = AnsibleModule(
         argument_spec=dict(
@@ -62,6 +63,6 @@ def main():
         result['ping'] = module.params['data']
     module.exit_json(**result)
 
+
 if __name__ == '__main__':
     main()
-