Update for ImageMagick, ImageMagick.256, Mozilla... recommended low

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
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