use configured ansible_shell_executable

refine args/shell/executable hanlding

lib/ansible/plugins/action/__init__.py

@@ -607,6 +607,9 @@ class ActionBase(with_metaclass(ABCMeta, object)):
         # give the module the socket for persistent connections
         module_args['_ansible_socket'] = task_vars.get('ansible_socket')
 
+        # make sure all commands use the designated shell executable
+        module_args['_ansible_shell_executable'] = self._play_context.executable
+
     def _execute_module(self, module_name=None, module_args=None, tmp=None, task_vars=None, persist_files=False, delete_remote_tmp=True, wrap_async=False):
         '''
         Transfer and run a module along with its arguments.