ID for PerfTest jobs and Unique system out for better output in multithreading.

[abousselmi]

Dear reviewer,
I added an ID variable to PerfTest.java to identify each running test.
I also modified the System.out to work better when multiple PerfTest threads are running in the same machine.
Best regards,
AB.

[michaelklishin]

Thank you. I am not 100% sure we should ship this in 3.6.x so it will have to wait for 4.0.0 (née 3.7.0).

[abousselmi]

Thank you for your reply. Until then!

[acogoluegnes]

@abousselmi maybe you could rename showRate to getRate now it returns a String and no longer shows something in the console?

[abousselmi]

It's a good idea! Will do it. Thank you.

[abousselmi]

@acogoluegnes I added a test id also to the final output messages, whould it be possible to make a new pull request for it ? Thank you.

[michaelklishin]

@abousselmi you can submit a new pull request, sure.

[abousselmi]

Thank you for you reply.