##### SUMMARY
helpers contains call to Display.deprecated or AnsibleModule.deprecate and is scheduled for removal

```
lib/ansible/playbook/helpers.py:158:20: ansible-deprecated-version: Deprecated version ('2.12') found in call to Display.deprecated or AnsibleModule.deprecate (0%)
lib/ansible/playbook/helpers.py:255:24: ansible-deprecated-version: Deprecated version ('2.12') found in call to Display.deprecated or AnsibleModule.deprecate (0%)
lib/ansible/playbook/helpers.py:298:24: ansible-deprecated-version: Deprecated version ('2.12') found in call to Display.deprecated or AnsibleModule.deprecate (0%)
lib/ansible/playbook/helpers.py:336:20: ansible-deprecated-version: Deprecated version ('2.12') found in call to Display.deprecated or AnsibleModule.deprecate (0%)
```

##### ISSUE TYPE
 - Bug Report

##### COMPONENT NAME
```
lib/ansible/playbook/helpers.py
```

##### ANSIBLE VERSION
```
2.12
```

##### CONFIGURATION
N/A

##### OS / ENVIRONMENT
N/A

##### STEPS TO REPRODUCE
N/A

##### EXPECTED RESULTS
N/A

##### ACTUAL RESULTS
N/A

ds = [{'include': "/dev/null/includes/other_test_include.yml",
               'vars': {'tags': "['tag_on_include1', 'tag_on_include2']"},
               'tags': 'mixed_tag1, mixed_tag2'
               }]
        self.assertRaisesRegexp(errors.AnsibleParserError, 'Mixing styles',
                                helpers.load_list_of_tasks,
                                ds, play=self.mock_play,
                                variable_manager=self.mock_variable_manager, loader=self.fake_include_loader)
    def test_one_include_tags_deprecated_include(self):
        ds = [{'include': '/dev/null/includes/other_test_include.yml',
               'vars': {'tags': ['include_tag1_deprecated', 'and_another_tagB_deprecated']}
               }]
        res = helpers.load_list_of_tasks(ds, play=self.mock_play,
                                         variable_manager=self.mock_variable_manager, loader=self.fake_include_loader)
        self._assert_is_task_list_or_blocks(res)
        self.assertIsInstance(res[0], Block)
        self.assertIn('include_tag1_deprecated', res[0].tags)
        self.assertIn('and_another_tagB_deprecated', res[0].tags)
    def test_one_include_use_handlers(self):
        ds = [{'include': '/dev/null/includes/other_test_include.yml'}]
        res = helpers.load_list_of_tasks(ds, play=self.mock_play,
                                         use_handlers=True,
                                         variable_manager=self.mock_variable_manager, loader=self.fake_include_loader)
        self._assert_is_task_list_or_blocks(res)
        self.assertIsInstance(res[0], Handler)
    def test_one_parent_include_use_handlers(self):