* Intermediate changes for Connected UDP.
* Add more changes to support connected UDP.
There is an issue with this approach, as multiple sockets are not able
to listen on connected UDP. We need to add SO_REUSEPORT to make this a
viable solution. This would be done in a later commit but before this
change is merged into master.
* Minor code cleanup.
Ethr is a network performance measurement tool. It allows measurements
of bandwidth, latency, packets/s, connections/s for multiple protocols
such as TCP, UDP, HTTP, HTTPS and ICMP.
