<!--- 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 -->

from __future__ import absolute_import, division, print_function
__metaclass__ = type
import json
from ansible.module_utils.urls import open_url
from ansible.module_utils._text import to_text
from ansible.module_utils.six.moves import http_client
from ansible.module_utils.six.moves.urllib.error import URLError, HTTPError
GET_HEADERS = {'accept': 'application/json', 'OData-Version': '4.0'}
POST_HEADERS = {'content-type': 'application/json', 'accept': 'application/json',
                'OData-Version': '4.0'}
PATCH_HEADERS = {'content-type': 'application/json', 'accept': 'application/json',
                 'OData-Version': '4.0'}
DELETE_HEADERS = {'accept': 'application/json', 'OData-Version': '4.0'}
DEPRECATE_MSG = 'Issuing a data modification command without specifying the '\
                'ID of the target %(resource)s resource when there is more '\
                'than one %(resource)s will use the first one in the '\
                'collection. Use the `resource_id` option to specify the '\
                'target %(resource)s ID'
class RedfishUtils(object):