shweta's changes so that quenado tests use generic packet structure

* on my box, CZMQToolkitTests.CalculateHeadersBigMessageBench is failing, saying it's processing transactions at 3406.12Mbps instead of 5000mbps.  HOWEVER, the test fails in the exact same way without these changers.  Someone @KjellKod ? should run this code on a different box before it is merged