OF1.3 handshake unit tests updated. All unit tests can be run together and...

OF1.3 handshake unit tests updated. All unit tests can be run together and have zero errors but one failure. The failure is in Forwarding and is expected for the time being until OFMessageDamper/Loxigen is fixed to ignore XIDs in OFMessages. In the previous commit, the unit tests for the flowcache package were completely removed due to the effort required to fix them. I don't know if completely removing the flowcache package though is the best idea. Even if it's not tested and not proven scalable, people might benefit from being able to look at the code. Thus, I've left the package in, at least for the time being.