explicitly mark unused variables found by pylint with _ or dummy

pylint don't ignores unused variables with '_' in the name, even when
they are started with '_'. This bug is already fixed upstream, to fix
this in all versions of pylint custom dummy-variables-rgx is used
'_+$|(_[a-zA-Z0-9_]*[a-zA-Z0-9]+?$)|dummy'

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#!/bin/sh

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LC_ALL=ru_RU.utf-8

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export DISPLAY=:42

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Xvfb $DISPLAY -screen 0 1280x1024x24 &

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sleep 1

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ret=0

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DELAY=400

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KILL_DELAY=$(($DELAY + 30))

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timeout -k $KILL_DELAY $DELAY pytest --timeout=10 ./tests/tools

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ret=$?

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pkill -9 Xvfb

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exit $ret