Ensure DogStatsD source has full support for all listener types.

[tobz]

Context

The DogStatsD source must have full support for all listener types:

• UDP
• Unix Domain Sockets, in both datagram (SOCK_DGRAM) and stream (SOCK_STREAM) mode

It should also be able to run multiple listeners at the same time, consistent with the Datadog Agent.

In scope

• Adding support for all listener types
• Adding support for multiple listeners

Work items

(non-exhaustive, living list)

None at the moment.

[tobz]

(commenting for posterity)

This is complete.

The source has full support for UDP, and both variants of Unix Domain Sockets. Similarly, it can listen on all three types simultaneously.