common/ocp_resources should not hard code handling of all files to be processed

[RobertKrawitz]

Is your feature request related to a problem? Please describe. Currently common/ocp_resources has inline code to handle each resource file that needs to be processed. This should be generalized. At present, whenever a new resource file is added, corresponding code has to be added to handle it. That's clumsy and error-prone.

Describe the solution you'd like nn-resource files should be Python code imported and run on the fly that does everything the inline code does; the dispatcher simply loads each file in lexical sequence. This is similar to how other systems files (e. g. /etc/NetworkManager/dispatcher.d) handle this.

Describe alternatives you've considered None

Additional context This is cleanup, not really either a bug or a feature.