<!--- 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 -->

ret = True
        entries = []
        for uri in uri_list:
            inventory = func(uri)
            ret = inventory.pop('ret') and ret
            if 'entries' in inventory:
                entries.append(({uri_name: uri},
                                inventory['entries']))
        return dict(ret=ret, entries=entries)
    def aggregate_chassis(self, func):
        return self.aggregate(func, self.chassis_uris, 'chassis_uri')
    def aggregate_managers(self, func):
        return self.aggregate(func, self.manager_uris, 'manager_uri')
    def aggregate_systems(self, func):
        return self.aggregate(func, self.systems_uris, 'system_uri')
    def get_storage_controller_inventory(self, systems_uri):
        result = {}
        controller_list = []
        controller_results = []
        
        properties = ['CacheSummary', 'FirmwareVersion', 'Identifiers',
                      'Location', 'Manufacturer', 'Model', 'Name',
                      'PartNumber', 'SerialNumber', 'SpeedGbps', 'Status']
        key = "StorageControllers"
        
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response