ipv6, rcnetwork returns before dad completed

This update fixes the following issue for sysconfig:
- 697929: Fixed to wait for the end of ipv6 duplicate
address detection, that can cause failures of further
services. Added LINK_READY_WAIT and IPV6_DAD_WAIT
variables

Fixed bugs
bnc#697929
ipv6, rcnetwork returns before dad completed
Selected Binaries
openSUSE Build Service is sponsored by