<!--- 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 -->

data = response['data']
        if 'Storage' not in data:
            return {'ret': False, 'msg': "Storage resource not found"}
        
        storage_uri = data['Storage']["@odata.id"]
        response = self.get_request(self.root_uri + storage_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']
        
        
        if data[u'Members']:
            for storage_member in data[u'Members']:
                storage_member_uri = storage_member[u'@odata.id']
                response = self.get_request(self.root_uri + storage_member_uri)
                data = response['data']
                if key in data:
                    controller_list = data[key]
                    for controller in controller_list:
                        controller_result = {}
                        for property in properties:
                            if property in controller:
                                controller_result[property] = controller[property]
                        controller_results.append(controller_result)
                result['entries'] = controller_results
            return result
        else:
            return {'ret': False, 'msg': "Storage resource not found"}
    def get_multi_storage_controller_inventory(self):