Results and Error Messages in node-upgrade

When the node-upgrade command is run with valid arguments and parameters, the program will return exit status 0 and the following results and error messages may be returned for each node listed.

Result	Causes
SUCCESS	Node upgrade succeeded
FileNotFoundError	No upgrade file found matching provided device family or version
UpgradeError	Device already has same or higher firmware version Network connection lost
IncompatibleFirmwareError	Firmware file provided does not match the product family

In addition, the following exit statuses may be returned.

Exit Status	Description
0	Command exited normally
1	Invalid parameter
2	Unknown argument