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
Remove SuSEconfig call for postfix
Remove SuSEconfig call for sendmail
Removed disabled and obsolete code.
Fixed testsuite after postfix and sendmail SUSEConfig calls removal.
Updated changelog.
Removed obsolete RunSuSEconfigModule.
Removed SuSEConfig call for apache2.

Apache2's SuSEConfig module was removed sometime in 2005 (SLES10).
Updated testsuite so it reflects removal of SuSEConfig for apache2.
Removed gdm's SuSEconfig call.

According changes in gdm package the script was dropped in 2010.
Replaced SuSEconfig.isdn call.

According i4l-base.changes it was replaced by:

/etc/sysconfig/isdn/scripts/postprocess.isdn

since OpenSUSE 12.3.
Modified messages. SuSEconfig has gone ...
Modified messages. SuSEconfig has gone ...
Merge pull request #59 from mchf/master

SUSEconfig calls removed
Merge branch 'master' of github.com:mchf/yast-network