ethernet: lower ethtool not supported messages to debugs
Merge pull request #431 from kmroz/ethtool-debugs

ethernet: lower ethtool not supported messages to debugs
routes: generate routes also without IP (bnc#895219)
routes: show a note about not matching routes (bnc#895219)
Merge pull request #433 from mtomaschewski/af-static

routes: generate routes also without IP (bnc#895219)
README: updated / improved