Avoid querying non-supported hardware features

Avoid querying non-supported hardware features

Change the feature query test to avoid querying information on hardware
features that are not supported. This is done by querying non-existing
feature (max_enum) instead, which must be ignored by implementations.

The change also adds comment to all generated files stating what script
generates the files.

Affects:
dEQP-VK.api.info.get_physical_device_properties2.features

Components: Vulkan
VK-GL-CTS issue: 2853

Change-Id: I24a3832abc0721e649edbb112bd7f776c2b5d7f4