Recommended update for yast2-services-manager

This update for yast2-services-manager fixes the following issues:

- Set BaseTargets::GRAPHICAL and Target::GRAPHICAL if package "xdm"
will be installed (instead of xorg-x11-server) (bsc#1140735).

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
YaST: xorg-x11-server package makes the default even with no xdm/displaymanager packages been installed --> nobody disables plymouth --> no Linux console for login available
Selected Binaries
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