Add tests for scissor constraint

Add tests for scissor constraint

Test that scissor is correctly clamped to the framebuffer size.

New tests:
dEQP-VK.draw.scissor.static_scissor_framebuffer_border_in
dEQP-VK.draw.scissor.dynamic_scissor_framebuffer_border_in
dEQP-VK.draw.scissor.static_scissor_framebuffer_border_out
dEQP-VK.draw.scissor.dynamic_scissor_framebuffer_border_out
dEQP-VK.draw.scissor.static_scissor_oversized
dEQP-VK.draw.scissor.dynamic_scissor_oversized

Components: Vulkan
VK-GL-CTS issue: 2095

Change-Id: I7e15e4db12380c84cd7d7297de62bca0a7551f2e