* Add GetSupportedFirmwareUpdateMethods to update category commands list
* Add condition when command == GetSupportedFirmwareUpdateMethods to call the forthcoming rf_utils function get_supported_firmware_update_methods
* Implement get_supporte_firmware_update_methods() in redfish_utils
* rename command to GetFirmwareUpdateCapabilities
* rename comand get_firmware_update_capabilities()
* Rename command get_firmware_update_capabilities()
* Group update protocols by the type of Action they are associated with.
* remove trailing whitespace
* Use safer method to get 'title' for each action type and its allowablevalues
* Add example to docstring for using GetFirmwareUpdateCapabilities
* fix line too long
* fix line too long and trailing whitespace
* Update redfish_utils.py
* remove trailing whitespace
* fix overindent
* Use self.update_uri instead of hard-coding '/redfish/v1' in get_firmware_update_capabilities()