tests/beakerlib/Tuned-takes-too-long-to-reload-start-when-ulimit/runtest.sh should be more clear

Test checks if there is delay after tuned start.

It exploits small time window among beakerlib commands which is not clear at first look.

Maybe just add `sleep .5` and more comments will help.
Or maybe use `timeout` command in combination with exploit of "race condition".