The TENTH_TIMEOUT was not delcared as an int and failed to be set with
the correct number. The test of the function did not catch this.
Implement computing of the increasingly large sleep delays in a separate
function so that it can be tested more easily. Give up on sub-second
sleep because a the function will not sleep at all if the cluster is
already clean. And if it is not already clean, it is very unlikely to
become clean within less than a second. The downside of having very
short sleep time is that it needlessly stress the machine and also
possibly spam the logs.