<!--- 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 -->

status = 'Status'
        if expanded:
            d = expanded
        else:
            r = self.get_request(self.root_uri + uri)
            if r.get('ret'):
                d = r.get('data')
            else:
                return
        if 'Members' in d:  
            for m in d.get('Members'):
                u = m.get('@odata.id')
                r = self.get_request(self.root_uri + u)
                if r.get('ret'):
                    p = r.get('data')
                    if p:
                        e = {self.to_singular(subsystem.lower()) + '_uri': u,
                             status: p.get(status,
                                           "Status not available")}
                        health[subsystem].append(e)
        else:  
            e = {self.to_singular(subsystem.lower()) + '_uri': uri,
                 status: d.get(status,
                               "Status not available")}
            health[subsystem].append(e)
    def get_health_subsystem(self, subsystem, data, health):