Merge pull request #452 from pwieczorkiewicz/ethtool-nofail

ethernet: Do not fail when ETHTOOL_GSET/SSET fails (bnc#900112)
Merge pull request #454 from mtomaschewski/ethtool-defaults

dbus: omit ethernet speed,duplex,autoneg defaults
version 0.6.12
Merge branch 'master' into testing