<!--- Verify first that your feature was not already discussed on GitHub -->
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##### 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 -->

result = {}
        fan_results = []
        key = "Thermal"
        
        properties = ['FanName', 'Reading', 'ReadingUnits', 'Status']
        
        for chassis_uri in self.chassis_uris:
            response = self.get_request(self.root_uri + chassis_uri)
            if response['ret'] is False:
                return response
            result['ret'] = True
            data = response['data']
            if key in data:
                
                thermal_uri = data[key]["@odata.id"]
                response = self.get_request(self.root_uri + thermal_uri)
                if response['ret'] is False:
                    return response
                result['ret'] = True
                data = response['data']
                for device in data[u'Fans']:
                    fan = {}
                    for property in properties:
                        if property in device:
                            fan[property] = device[property]
                    fan_results.append(fan)
        result["entries"] = fan_results
        return result
    def get_chassis_power(self):