<!--- 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 -->

type: str
  command:
    required: true
    description:
      - List of commands to execute on OOB controller
    type: list
  baseuri:
    required: true
    description:
      - Base URI of OOB controller
    type: str
  username:
    required: true
    description:
      - Username for authentication with OOB controller
    type: str
    version_added: "2.8"
  password:
    required: true
    description:
      - Password for authentication with OOB controller
    type: str
  id:
    required: false
    aliases: [ account_id ]
    description:
      - ID of account to delete/modify
    type: str
    version_added: "2.8"
  new_username: