sysconfig: Two fixes

This update fixes the following issues with sysconfig:
- bnc#846031: Skip also systemd redirection for ifdown -o ifplugd (bnc#846031).
- bnc#845792: Fixed to check restorecon existence before calling it as selinux is not installed by default

Fixed bugs
bnc#845792
SELinux policy issues with netconfig
bnc#846031
dhcpcd is exiting when system configured using ifup
Selected Binaries
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