yast2-security: correctly read/write ctrl-alt-delete behavior when systemd is used

This update fixes the following issue for yast2-security:
- 742783: corectly read/write ctrl-alt-delete behavior when systemd is used

Fixed bugs
bnc#742783
ctrl-alt-delete in runlevel 3 causes a reboot although shutdown is configured in yast
Selected Binaries
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