Enable / implement Fluentd forward protocol over TCP/socket handling by Fluentbeat

[salekseev]

This Beat need to be able to accept Fluentd Forward Protocol Specification v1 forward protocol via TCP on loopback (127.0.0.1 and/or ::1) addresses using one thread per client, then convert to JSON event compatible with libbeat Publisher event.

Alternatively it could be implemented with a UNIX domain socket instead of the TCP.

Potential Fluentd protocol implementations to consider:
http://github.com/fluent/fluent-logger-golang
http://github.com/fluent/fluentd-forwarder
http://github.com/moriyoshi/ik

Some examples of making a threaded TCP server:
http://www.minaandrawos.com/2014/05/27/practical-guide-protocol-buffers-protobuf-go-golang/#GOTCPServer

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