utils: fixed route print realm bug causing a segfault
leasefile: init hop in route nexthop parsing
ipv4: fix duplicate address detection (bnc#881475)

Also check other links, which may be connected to the
same broadcast domain and report our ip-address too.
dhcp4: recover lease and corretly build requests (bnc#881475)
Merge pull request #288 from mtomaschewski/dhcp4-arp-dad

dhcp4: recover lease, correctly build requests, dad-check fix