Nowadays network interfaces have names like docker0, team0, ip_vti0, eno,
wlp61s0 and so on. Including word "Interface" in beginning of
graph_title groups these graphs together in web interface, not randomly
before/after other network-graphs (ipconntrack, firewall, ...).
See commit 70711831c44 in munin repository for similar change.
ethtool prints the error message "Cannot get device settings: No such
device" for VLAN devices. This error message should not be exposed via
the munin protocol.
munin-node passes the original interface name (as extracted from
/proc/net/dev) to if_* and if_err_*. Thus replacing dash with underscore
results in interfaces not being found anymore.
Source: patch "220-modify-ifname-parser" from OpenWrt
Author: Martin Blumenstingl
Changed type to DERIVE and added min values to 0. Added check for
ethtool to check if max value could be calculated
git-svn-id: svn://svn.code.sf.net/p/muninlite/code/muninlite@11 35caa317-6b62-4e8a-81c0-b04f0c356266
