<!--- 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 -->

if subsystem in data:
            sub = data.get(subsystem)
            if isinstance(sub, list):
                for r in sub:
                    if '@odata.id' in r:
                        uri = r.get('@odata.id')
                        expanded = None
                        if '#' in uri and len(r) > 1:
                            expanded = r
                        self.get_health_resource(subsystem, uri, health, expanded)
            elif isinstance(sub, dict):
                if '@odata.id' in sub:
                    uri = sub.get('@odata.id')
                    self.get_health_resource(subsystem, uri, health, None)
        elif 'Members' in data:
            for m in data.get('Members'):
                u = m.get('@odata.id')
                r = self.get_request(self.root_uri + u)
                if r.get('ret'):
                    d = r.get('data')
                    self.get_health_subsystem(subsystem, d, health)
    def get_health_report(self, category, uri, subsystems):