<!--- 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 -->

category=dict(required=True),
            command=dict(required=True, type='list'),
            baseuri=dict(required=True),
            username=dict(required=True),
            password=dict(required=True, no_log=True),
            id=dict(aliases=["account_id"]),
            new_username=dict(aliases=["account_username"]),
            new_password=dict(aliases=["account_password"], no_log=True),
            roleid=dict(aliases=["account_roleid"]),
            update_username=dict(type='str', aliases=["account_updatename"]),
            account_properties=dict(type='dict', default={}),
            bootdevice=dict(),
            timeout=dict(type='int', default=10),
            uefi_target=dict(),
            boot_next=dict(),
            resource_id=dict()
        ),
        supports_check_mode=False
    )
    category = module.params['category']
    command_list = module.params['command']
    
    creds = {'user': module.params['username'],
             'pswd': module.params['password']}
    
    user = {'account_id': module.params['id'],
            'account_username': module.params['new_username'],
            'account_password': module.params['new_password'],
            'account_roleid': module.params['roleid'],
            'account_updatename': module.params['update_username'],