Speed up hierarchy traversal, part 1

Speed up hierarchy traversal, part 1

Some of the tests do premature heavy work during test hierarchy
traversal, meaning that they waste time regardless of whether the tests
are run or not. These changes move some of that heavy work to later
stage of the test run.

Affects:

dEQP-VK.ubo.*
dEQP-VK.ssbo.*

Components: Vulkan, Framework

VK-GL-CTS issue: 1830

Change-Id: I437e55ee2d57efc69edf62a213f7476a22b1a2f0