- ifconfig: apply address lease priorities same as for routes
  to dhcp6 to takeover addresses from guessed lower-priority
  leases e.g. after restart and adjust lifetime on renewal.
- routes: lookup and accept custom table names defined in the
  /etc/iproute2/rt_tables file and set forgotten route table
  netlink attibute if provided by the kernel (bnc#885007).
- ethernet: do not fail when some ethtool operation is not
  supported (bnc#897264)
- fsm: add link-masterdev relation when all dependencies are
  already created and detect existing/conflicting masterdev
  references.