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

Validation fixes for dEQP-VK.glsl

- Use uint type for booleans to match attribute format
- Don't bind descriptor set when it's not updated
- Use correct number of vertex input bindings
- Use correct color attachment format and layout
- Use correct access flags and layout in image barriers

Validation fixes are tracked in #357

See merge request !530