Update logic in receiver to look for either transient headers or non-transient headers

[cwperks]

This updates the logic in the SecurityRequestHandler to look to see whether transient (non-serialized) headers are present in the ThreadContext or if non-transient (serialized) headers are present. If transient headers are present, no deserialization needs to take place. If serialized headers are present than it will deserialized. The logic to determine whether to serialized headers or not is only placed in the sender. The headers will be serialized for requests to remote nodes, but no serialization should take place for requests on the local node.