Workaround problem with node not closed correctly

Piotr Batko requested to merge pbatko/fix-test-tools-freezing into master

Pytest has a bug, which interrupts test teardown, when warning is emitted. This bug is visible only, when warnings are treated as errors. So I turned off treating warnings as errors, wrote issue on Pytest repo. When problem will be fixed, I will revert this commit.

Issue in pytest repo:

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