Add render pass multisample resolve tests

Add render pass multisample resolve tests

- Check that attachment components are resolved consistently
- Check that attachments are resolved consistently
- Check that integer formats always resolve to one of the samples
- Check that empty sample mask doesn't change values
- Check that all possible sample combinations of 1.0 and 0.0 values
  resolve to 0.5 on average.

VK-GL-CTS issues: 96
Components: Vulkan

Change-Id: I18b92ed713175cd935651575f4e48d9fd207ef00