For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rhabacker:maintenance/openSUSE_Tumbleweed/home:rhabacker:maintenance.repo
zypper refresh
zypper install zypper-restart-services-plugin
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rhabacker:maintenance/16.0/home:rhabacker:maintenance.repo
zypper refresh
zypper install zypper-restart-services-plugin
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rhabacker:maintenance/15.6/home:rhabacker:maintenance.repo
zypper refresh
zypper install zypper-restart-services-plugin