Merge branch '47-fix-multisample-state' into 'master'

Added multisampeStateParams to graphics pipeline creation, fixes #47

Set a valid VkPipelineMultisampleStateCreateInfo structure to pMultisampleState as declared in api spec.

See merge request !171

diff --cc external/vulkancts/modules/vulkan/api/vktApiBufferViewAccessTests.cpp
Simple merge

diff --cc external/vulkancts/modules/vulkan/shaderexecutor/vktShaderExecutor.cpp
Simple merge

diff --cc external/vulkancts/modules/vulkan/shaderrender/vktShaderRender.cpp
Simple merge