Merge branch 'scygan-wsi' into 'vulkan-cts-1.0-dev'

vktWsiSwapchainTests: fixed bugs and removed unnecessary barriers.

  * VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR may be unsupported - use transform returned from API

  * `capabilities.maxImageCount == 0` means no limits, test should account for that

  * Additionally two barriers are removed - they are unnessary, as given transitions are already performed by renderpass

  * do not depend on optional depth clamp feature

  * fixed bug in surface capabilities validation where surface's height was tested with respect to width's limits.

See merge request !559