* nGraph: Fix TopK output shape inference
* nGraph: Correct TopK output shape inference
TopK lower bound of output shape at the axis was mistakenly calculated
basing on max_lenght instead of min_lenght.
* nGraph: Correct TopK output shape inference
* nGraph: Correct TopK type prop test
The topk_negative_axis_support type properties test was comparing
incompatible variables carrying the same value. So it was passing ok.
* nGraph: Add TopK type prop test
* nGraph: Fix code style
* nGraph: Follow review guidelines
Improve variables meaning.
Enforce rigid test pass condition.
* nGraph: Remove magic numbers
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