Added interface plugin back, rewritten.

plugins.d/if

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# this plugin was rewritten to avoid licensing conflicts.
+if [ "$1" == "config" ];then
+	echo "graph_order up down
+graph_title $2 traffic
+graph_args --base 1000
+graph_vlabel bps in/out
+graph_category network
+down.label bps
+down.type DERIVE
+down.min 0
+down.negative up
+down.cdef down,8,*
+up.label bps
+up.type DERIVE
+up.min 0
+up.graph no
+up.cdef up,8,*"
+	exit 0
+fi
+
+/bin/grep "\b$1:" /proc/net/dev|awk '{print "down.value "$2"\nup.value "$10}'