tests: Test cases for external fence
tests: Test cases for external fence

Change-Id: Id7e719d031d8f4842ff14f5bc767d42f5ad8d064

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