TChannel: Exposing enough init req/res headers to identify sockets

[Raynos]

We currently may or may not send process title.

We probably want to send the actual "deployable service name" and maybe "version", maybe "worker number", maybe "hostname".

This will allow us to more easily debug issues with 'there is something weird for this ip:port'.

We should also update the node tchannel code to extend logs with connection meta info.

[jcorbin]

Worker id, should not be restricted numeric.