<!--- 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 -->

version_added: '2.8'
  uefi_target:
    required: false
    description:
      - UEFI target when bootdevice is "UefiTarget"
    type: str
    version_added: "2.9"
  boot_next:
    required: false
    description:
      - BootNext target when bootdevice is "UefiBootNext"
    type: str
    version_added: "2.9"
  update_username:
    required: false
    aliases: [ account_updatename ]
    description:
      - new update user name for account_username
    type: str
    version_added: "2.10"
  account_properties:
    required: false
    description:
      - properties of account service to update
    type: dict
    version_added: "2.10"
  resource_id:
    required: false
    description:
      - The ID of the System, Manager or Chassis to modify