Improved handling of txnrs
Improved handling of txnrs

txnrs are now automatically handled for all client transmissions
unless they are hints (txnr=0). I think for server transmissions we
simply have to trust that the application code is getting them
correct.

joekiller/logstash-kafka,joekiller/logstash-kafka,tinglinux/logstash-kafka,opentable/logstash-kafka,Aloomaio/logstash-kafka,opentable/logstash-kafka,Aloomaio/logstash-kafka,tinglinux/logstash-kafka