<!--- 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 -->

return {'ret': False,
                        'msg': "Boot device %s not in list of allowable values (%s)" %
                               (bootdevice, allowable_values)}
        
        enabled = boot.get('BootSourceOverrideEnabled')
        target = boot.get('BootSourceOverrideTarget')
        cur_uefi_target = boot.get('UefiTargetBootSourceOverride')
        cur_boot_next = boot.get('BootNext')
        if bootdevice == 'UefiTarget':
            if not uefi_target:
                return {'ret': False,
                        'msg': "uefi_target option required to SetOneTimeBoot for UefiTarget"}
            if enabled == 'Once' and target == bootdevice and uefi_target == cur_uefi_target:
                
                return {'ret': True, 'changed': False}
            payload = {
                'Boot': {
                    'BootSourceOverrideEnabled': 'Once',
                    'BootSourceOverrideTarget': bootdevice,
                    'UefiTargetBootSourceOverride': uefi_target
                }
            }
        elif bootdevice == 'UefiBootNext':
            if not boot_next:
                return {'ret': False,
                        'msg': "boot_next option required to SetOneTimeBoot for UefiBootNext"}
            if enabled == 'Once' and target == bootdevice and boot_next == cur_boot_next:
                
                return {'ret': True, 'changed': False}
            payload = {