<!--- Verify first that your feature was not already discussed on GitHub -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
This feature would implement a ClearSessions command for the Sessions category of redfish_command, to clear all active sessions.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
redfish_command.py
redfish_utils.py

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
This command would help user to clear all active sessions.

<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

<!--- HINT: You can also paste gist.github.com links for larger files -->

response = self._find_account_uri(username=user.get('account_username'),
                                          acct_id=user.get('account_id'))
        if not response['ret']:
            if response.get('no_match'):
                
                return {'ret': True, 'changed': False}
            else:
                
                return response
        uri = response['uri']
        headers = response['headers']
        data = response['data']
        if 'allow' in headers:
            methods = [m.strip() for m in headers.get('allow').split(',')]
            if 'DELETE' not in methods:
                
                return self.delete_user_via_patch(user, uri=uri, data=data)
        response = self.delete_request(self.root_uri + uri)
        if not response['ret']:
            if response.get('status') == 405:
                
                return self.delete_user_via_patch(user, uri=uri, data=data)
            else:
                return response
        return {'ret': True}
    def disable_user(self, user):