scripts:Cleanup comments and output for mock icd
scripts:Cleanup comments and output for mock icd

Commented out a couple of debug output statements.
Killed a bunch of comments and code that were carried over from
original script but that are no longer relevant.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools