bonding: add new/missed bonding options (bsc#905750)

Added arp validate filter, filter_active, filter_backup option
values and new arp validate any/all targets, packets-per-slave,
lp-interval and tlb-dynamic-lb options.
service: added After=network-pre in wicked (bsc#901337)

Added After=network-pre.target ordering dependency for services
which want to run before network is set up, e.g. firewall init.
service: no Before=SuSEfirewall2 in wicked (bsc#895600)

Removed unneeded Before=SuSEfirewall2.service ordering dependency.
service: removed automatically resolved targets (bsc#895600)

Removed unneeded shutdown.target and multi-user.target, which
are added by systemd automatically as needed.
Merge pull request #474 from mtomaschewski/systemd-ordering-1
Merge pull request #475 from mtomaschewski/systemd-ordering-2