Automatic merge from submit-queue

Fix scheduler_perf test so that QPS is non-zero even if there is a scheduling "cold start" 

@gmarek  ... is something like this more realistic as an expectation ?  That is, wait till scheduling starts, then wait 1 second before any polling attempts....  i.e. 

- gaurantee uniform sleep before measure, by doing it first rather then last
- print the initial status so that its easier to debug in case of issues

#36532