<!--- 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 -->
Add new commands to the Redfish remote_management modules to perform firmware update requests.

##### 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_config.py
redfish_utils.py

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
Operators need a way to update firmware on Redfish managed systems. Would like an extension made to be able to perform SimpleUpdate actions with a specified firmware image. At the very minimum we can point to a remote HTTP/TFTP/SCP/etc server, but if possible, it might be good to spin up a lightweight HTTP server to service the request in case one isn't provisioned.

<!--- Paste example playbooks or commands between quotes below -->
```yaml
  - name: Pull style update
    redfish_config:
      category: Update
      command: PullUpdate
      image: http://my.file.repo/someimage.bin
      targets:
        - /redfish/v1/Systems/1
        - /redfish/v1/Systems/2
      baseuri: "{{ baseuri }}"
      username: "{{ username }}"
      password: "{{ password }}"
```

<!--- HINT: You can also paste gist.github.com links for larger files -->

if not any((username, acct_id)):
            return {'ret': False, 'msg':
                    'Must provide either account_id or account_username'}
        response = self.get_request(self.root_uri + self.accounts_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        uris = [a.get('@odata.id') for a in data.get('Members', []) if
                a.get('@odata.id')]
        for uri in uris:
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                continue
            data = response['data']
            headers = response['headers']
            if username:
                if username == data.get('UserName'):
                    return {'ret': True, 'data': data,
                            'headers': headers, 'uri': uri}
            if acct_id:
                if acct_id == data.get('Id'):
                    return {'ret': True, 'data': data,
                            'headers': headers, 'uri': uri}
        return {'ret': False, 'no_match': True, 'msg':
                'No account with the given account_id or account_username found'}
    def _find_empty_account_slot(self):