Producer rate control interferes with confirm limits.

Move rate control delay to before confirm.acquire, since the latter may block, spoiling the rate calculations;
also move now setting to after handleSend, since a report might delay the loop and prevent termination when it should.

Author: Steve Powell

test/src/com/rabbitmq/examples/perf/Producer.java

@@ -132,19 +132,19 @@ public void run() {
 
             while ((timeLimit == 0 || now < startTime + timeLimit) &&
                    (msgLimit == 0 || msgCount < msgLimit)) {
+                delay(now);
                 if (confirmPool != null) {
                     confirmPool.acquire();
                 }
-                delay(now);
                 publish(createMessage(totalMsgCount));
                 totalMsgCount++;
                 msgCount++;
 
                 if (txSize != 0 && totalMsgCount % txSize == 0) {
                     channel.txCommit();
                 }
-                now = System.currentTimeMillis();
                 stats.handleSend();
+                now = System.currentTimeMillis();
             }
 
         } catch (IOException e) {