avahi: do not start unconditionally / by default under sysconfig

This update fixes the following issue with avahi:
- bnc#853845, bnc#851953: do not start unconditionally / by default under sysconfig as it breaks vlan,bridge,bonding setups

Fixed bugs
bnc#853845
avahi-autoipd breaks vlan,bridge,bonding setups by starting unconditionally
bnc#851953
Network start insists on assigning addresses to bridge ports, breaking IPv6 on bridges
Selected Binaries
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