Test blitting from compressed formats

Test blitting from compressed formats

This change extends existing tests to also test blitting of BC*,
ETC and EAC compressed formats onto all compatible uncompressed
formats.

Functionality from PipelineImageUtil is reused in blit tests
to generate random compressed data that is also stored in
uncompressed version. Compressed data is used to do the blit
on GPU while uncompressed version is used for verification on CPU.

VK-GL-CTS issue: 2366

Components: Vulkan

Affects:
dEQP-VK.api.copy_and_blit.*

Change-Id: Ifab885dc09b2d663d95b49e25458873c2eb0b0c4