systemd: several fixes

This update fixes the following issues with systemd:
- bnc#808144: allow removal of some specific symlinks created when enabling services
- bnc#820454: fix potential memory corruption
- bnc#809420: ensure /boot/sysctl.conf-<kernel_release> is handled
- bnc#808319: update logind-nvidia-acl.diff to apply ACL to /dev/nvidia*

Fixed bugs
bnc#808144
systemd: disable fails to execute
bnc#808319
Default and new users no longer been added to 'video' group
bnc#809420
/boot/sysctl.conf-* not applied on boot
bnc#820454
[PATCH] systemd assertion fail on running systemd-nspawn on /var/tmp/build-root
Selected Binaries
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