<!--- 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 -->

response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'Chassis' not in data:
            return {'ret': False, 'msg': "Chassis resource not found"}
        chassis = data["Chassis"]["@odata.id"]
        response = self.get_request(self.root_uri + chassis)
        if response['ret'] is False:
            return response
        self.chassis_uris = [
            i['@odata.id'] for i in response['data'].get('Members', [])]
        if not self.chassis_uris:
            return {'ret': False,
                    'msg': "Chassis Members array is either empty or missing"}
        self.chassis_uri = self.chassis_uris[0]
        if self.data_modification:
            if self.resource_id:
                self.chassis_uri = self._get_resource_uri_by_id(self.chassis_uris,
                                                                self.resource_id)
                if not self.chassis_uri:
                    return {
                        'ret': False,
                        'msg': "Chassis resource %s not found" % self.resource_id}
            elif len(self.chassis_uris) > 1:
                self.module.deprecate(DEPRECATE_MSG % {'resource': 'Chassis'},
                                      version='2.14')
        return {'ret': True}
    def _find_managers_resource(self):