Add the ability to have the agent run a very simple HTTP endpoint for receiving logging messages

An agent should be able to internally support a very simple HTTP endpoint, listening either on a Unix socket or a TCP socket, so that both logging and telemetry could be PUSHED to the agent, and thus to minion. This would enable easy integration for apps or other entities that aren't necessarily writing all of their interesting data to the filesystem to be able to publish data into Minion, and it should be pretty trivial to build this capability into the agent.