Barrier responses delayed

A test was made by configuring the barrier-count-threshold = 8000 and the barrier-time-interval = 30 secs.

After that when 16000 flows were pushed to the switch, the futures of those flows got responses only after the 16000 flows got pushed to the switch.

I confirmed that 2 bariers were sent, 1 at 8000 and then at 16000.

But ideally the futures of the first 8000 would have been delivered before the 2nd batch of 8k.

This issues gets magnified when barrier responeses are not received at expected intervals as applications need to monitor memory and inject flows accordingly.