Adopted restart for use with network.service alias link

Adopted restart / reload using NetworkService instead Service, that
has been changed to use network.service alias link installed by the
NetworkManager service file while "systemctl enable".
It obsoletes the use of the NETWORKMANAGER=yes/no sysconfig variable
in /etc/sysconfig/network/config (bnc#764055,bnc#764336,bnc#798348).
Updated changelog, version 2.24.13
Fixed to require sysconfig >= 0.80.0
Fixed to also require yast2 >= 2.23.20
Removed incorrect NetworkService::ReloadOrRestart
Use Restart after bridge proposal rewrite
Merge remote-tracking branch 'mtomaschewski/bnc798348'

Conflicts:
	VERSION
	package/yast2-network.changes
Merge pull request #61 from mvidner/master

Adopted restart for use with network.service alias link
Merge remote-tracking branch 'upstream/master'