The hwtimer_wait test was tortured with the
following script which ran several hours.
----
make clean all-debug
while :
do
date
./bin/native/hwtimer_wait.elf > log &
pid=$!
sleep 20
success=$(cat log|grep success)
if [ "$success" != "success" ]
then
date
echo "BUG"
exit
fi
kill $pid
done
----
Closes#715.
