There are 2 changes -
1. Encode txPort in ttag packets and use it at TxTtagStats and
RxPcapStats to identify Tx and Rx packets respectively
2. Don't use pcap_sendqueue_transmit() if stream timing is in use -
since we can't modify TTAG packets inside that API
For now we are just debug printing timestamp with T-TagId and GUID. We
need to store this tuple and compare when we Rx the same - this will be
in a upcoming commit.
If a packet does not have a sign/guid, use an invalid guid instead of 0
as the default, so that these packets get tracked against the invalid
guid which can be excluded while updating the port's stream stats.
* Rename track_stream_stats to is_tracking_stream_stats for consistency
with other bool params
* Change signature magic value to CODA
* Resolve notify memory leak
