Don't sleep 30 minutes after final repetition in long-running

Prior to this commit, we were sleeping for 30 minutes after
every repetition of the agent requests in the long-running
simulation.  This sleep is not necessary after the final
repetition, and was adding 1-3 hours of unnecessary run time
to the jenkins jobs.  Getting rid of that last unnecessary
sleep should allow us to run through the jenkins jobs
much more quickly.
Merge pull request #19 from cprice-puppet/feature/master/PE-634_dont_sleep_after_final_rep

Don't sleep 30 minutes after final repetition in long-running