<!--- 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 -->

"DeleteUser": rf_utils.delete_user,
            "DisableUser": rf_utils.disable_user,
            "UpdateUserRole": rf_utils.update_user_role,
            "UpdateUserPassword": rf_utils.update_user_password,
            "UpdateUserName": rf_utils.update_user_name,
            "UpdateAccountServiceProperties": rf_utils.update_accountservice_properties
        }
        
        result = rf_utils._find_accountservice_resource()
        if result['ret'] is False:
            module.fail_json(msg=to_native(result['msg']))
        for command in command_list:
            result = ACCOUNTS_COMMANDS[command](user)
    elif category == "Systems":
        
        result = rf_utils._find_systems_resource()
        if result['ret'] is False:
            module.fail_json(msg=to_native(result['msg']))
        for command in command_list:
            if "Power" in command:
                result = rf_utils.manage_system_power(command)
            elif command == "SetOneTimeBoot":
                result = rf_utils.set_one_time_boot_device(
                    module.params['bootdevice'],
                    module.params['uefi_target'],
                    module.params['boot_next'])
    elif category == "Chassis":
        result = rf_utils._find_chassis_resource()
        if result['ret'] is False:
            module.fail_json(msg=to_native(result['msg']))