Test ReadRequirement type of "Supported"

[jautor]

There are use cases of the "Supported" type of ReadRequirement that could be tested reliably - meaning that the requirement isn't dependent on the configuration of the system under test. For those cases, it would be good to increase the validator's coverage.

The testing would be similar to the process for "AllOf" comparisons - if after checking every resource, the "Supported" property isn't found, it would be a failure. As long as the property is found at least once, it would pass.

Probably need a option/flag on how to handle these, though (warning or failure) so that hardware or configuration-dependent properties don't cause false failures.