- Use an unconditional rcnetwork symlink to /sbin/service

- version 0.83.0
- Recommend wicked-service instead of sysconfig-network as the
default network service and drop sysconfig-network. The wicked
service package provides systemd service files requesting the
network.service alias at service enable time as well as the
ifup compatibility scripts using wicked as network backend
(fate#316768,bnc#856591).
- ifcfg-bonding.5: fixed to use startmode hotplug in slave example
- Use ZEROCONF_ROUTE=no as new default (fate#314482)
The NOZEROCONF="yes" variable were double-negated in it's meaning
and did not reflect what the variable really does (fate#314482).

- rcnetwork: use service type oneshot, not forking
Sometimes, network fails to start / stops itself, because the per
interface services started inside it, need already started network
and fail as network did not yet reached started state. This does
not happen with oneshot network service type (bnc#853908).