### Summary

Add RedOS support for hostname module plugin

### Issue Type

Feature Idea

### Component Name

hostname

### Additional Information

Just add class of redos for hostname
```
class RedosHostname(Hostname):
    platform = 'Linux'
    distribution = 'RED'
    strategy_class = SystemdStrategy
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = '''
---
module: hostname
author:
    - Adrian Likins (@alikins)
    - Hideki Saito (@saito-hideki)
version_added: "1.4"
short_description: Manage hostname
requirements: [ hostname ]
description:
    - Set system's hostname. Supports most OSs/Distributions including those using C(systemd).
    - Windows, HP-UX, and AIX are not currently supported.
notes:
    - This module does B(NOT) modify C(/etc/hosts). You need to modify it yourself using other modules such as M(ansible.builtin.template)