Add tool to generate syntax validation tests for all IPP attributes registered in the IANA IPP Registry

[wifiprintguy]

There are cases where printers implement obscure but registered IPP attributes with incorrect attribute syntaxes, and these defective attribute implementations are not discovered until much later.

Create a tool similar to the crude one attached (written in Ruby) that downloads the current IANA IPP attribute registry, and generates a test for each registered attribute that checks that the attribute (if supported) provides a value with the correct syntax.

(Ruby script wrapped in a zip file wrapper because GitHub won't accept a raw Ruby script?)

ipp-registry-generate-tests.rb.zip