auto6: dropped non-functional ipv6 autoconf code
ifconfig: fixed lease updater allocation
address: update on refresh instead to drop and fetch
address: added an address copy (update) utility
address: use lease type owner instead lease pointer
ipv6: added accept-ra sysctl support
Merge pull request #421 from mtomaschewski/addrconf

addrconf: disarmed old auto6 code, added prerequires (bnc#894885)