<!--- 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 -->

return self.aggregate_systems(self.get_bios_attributes)
    def _get_boot_options_dict(self, boot):
        
        properties = ['DisplayName', 'BootOptionReference']
        
        if 'BootOptions' in boot and '@odata.id' in boot['BootOptions']:
            boot_options_uri = boot['BootOptions']["@odata.id"]
            
            response = self.get_request(self.root_uri + boot_options_uri)
            if response['ret'] is False:
                return {}
            data = response['data']
            
            if 'Members' not in data:
                return {}
            members = data['Members']
        else:
            members = []
        
        boot_options_dict = {}
        for member in members:
            if '@odata.id' not in member:
                return {}
            boot_option_uri = member['@odata.id']
            response = self.get_request(self.root_uri + boot_option_uri)
            if response['ret'] is False:
                return {}
            data = response['data']
            if 'BootOptionReference' not in data:
                return {}