Add tests for VK_EXT_sampler_filter_minmax

Add tests for VK_EXT_sampler_filter_minmax

This adds testing coverage for VK_EXT_sampler_filter_minmax extension,
that extends sampler by adding MIN/MAX/AVERAGE reduction filters.

Framework changes:
Add support for reduction modes in tcu: Sampler and TexLookupVerifier

Vulkan changes:
Add support for depth and depth/stencil images,
non-trivial component mappings (including ZERO and ONE swizzlers)
dEQP-VK.pipeline.sampler tests.

If filterMinmaxImageComponentMapping is enabled, check
required VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_MINMAX_BIT_EXT
flag in dEQP-VK.api.* tests.

Affects:
dEQP-VK.api.info.format_properties.*

New tests:
dEQP-VK.pipeline.sampler.view_type.*.format.(any color format).min_reduce.*
dEQP-VK.pipeline.sampler.view_type.*.format.(any color format).mag_reduce.*
dEQP-VK.pipeline.sampler.view_type.*.format.(any depth format)

Components: Framework, Vulkan

VK-GL-CTS issue: 627

Change-Id: Icd4be2517a0dcc91b32444dd805010c804c4c3fd