Check if the statistics query results are linear

Check if the statistics query results are linear

Current tests check if query results are greater than or equal to
minimum values defined by the specification.
The task of this commit is to create additional constraint that
checks if query results do not produce some random garbage values.
In case of vertex, geometry and tesselation queries it is enough
to perform the same tests few times with varying number of
input vertices and to check if query results are linear.
Linearity of query results is estimated using Pearson correlation
coefficient.

Affects tests:
dEQP-VK.query_pool.statistics_query.*

Components: Vulkan

VK-GL-CTS issue: 876

Change-Id: Ie58b53d2a35291f565ac9c88773a4c2fa5d89656