Support for Telegraf + UDP

[pshrosbree]

Currently connecting to InfluxDB via HTTP is well supported.
Another common setup with InfluxDB is to distribute Telegraf agents across hosts which then submit the data to database.

Telegraf supports a variety of protocols however UDP can be very beneficial as it is fire and forget.

(Original request at: AppMetrics/AppMetrics#152)

[Alessar]

Sending metrics from AppMetrics into Telegraf can be made with using Sockets layer.
New feature is implemented in AppMetrics/Reporting#50
It allows sending metrics via TCP and UDP protocols and with using unix domain sockets.

[alhardy]

Fixed by AppMetrics/Reporting#50