use CLOCK_MONOTONIC instead of CLOCK_REALTIME for timer setup

CLOCK_REALTIME is a wall clock, that could change back and forth (user
changes system time, winter/summer time, NTP corrections and so on).
For real-time application CLOCK_MONOTONIC should be used, it doesn't
have such jumps.

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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