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
