fix assertion of python_path, it should be always what 'discovered_interpreter' is

Author: s1113950

ansible_mitogen/plugins/action/mitogen_get_stack.py

@@ -52,4 +52,6 @@ def run(self, tmp=None, task_vars=None):
             'changed': True,
             'result': stack,
             '_ansible_verbose_always': True,
+            # for ansible < 2.8, we'll default to /usr/bin/python like before
+            'discovered_interpreter': self._connection._action._discovered_interpreter
         }

tests/ansible/integration/transport_config/python_path.yml

@@ -77,7 +77,8 @@
   - {mitogen_get_stack: {}, register: out}
   - assert_equal:
       left: out.result[0].kwargs.python_path
-      right: ["/usr/bin/python"]
+      right: ["{{out.discovered_interpreter}}"]
+
 
 - hosts: localhost
   vars: {mitogen_via: tc-python-path-local-unset}