Expand tests for mutable images

Expand tests for mutable images

Currently, only the image load/store tests use mutable images,
but these require the images's layout to be
VK_IMAGE_LAYOUT_GENERAL (requirement for image load/store) so they
don't provide coverage for the most interesting scenarios.

These tests add cases that mix combined image upload/download
methods that exercise various other image layouts and scenarios.
Specifically, it tests each of [copy, clear, draw, store] upload
methods with each of [copy, load, texture] download methods.

Components: Vulkan
VK-GL-CTS issue: 513

New Tests:
dEQP-VK.image.mutable.*

Change-Id: I01cd77ab250f9934e71f5c9997b850950c9bd552