Merge branch 'validation_fix_pipeline' into 'vulkan-cts-1.0-dev'

Validation fixes for dEQP-VK.pipeline.*

- Corrected out of range minDepthBounds value
- Added missing image layout transitions
- timestamp, cache tests: pass data through geometry shader
- cache test: use correct initialLayout in attachment when starting a second render pass

See #357 for more info.

Fixes issue #309, #351

See merge request !510