Be more intelligent about interfaces

Submitted by hug..@..rth.li

Assigned to Mike Massonnet

Link to original bug (#3880)

Description

A Debian user requested that the netload plugin try to make some effort to figure out what interfaces are available and choose a default appropriately so that this plugin works out of the box.

The full bug report is at: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=331170

Version: 0.4.0 or older