Revert "layers: Update vulkan.py with new extensions"
Revert "layers: Update vulkan.py with new extensions"

This reverts commit f504ff6e45bb15a0517a8de2e2d75e90df7e4627.
This caused huge issues in the VulkanTools repo, reverting for
now.

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers