syslogd: fix warning on lograte directory ownership

Adding 'su' option to syslogd lograte configuration to fix the following error message:

"/var/log/news" has insecure permissions. It must be owned and be
writable by root only to avoid security issues.

Fixed bugs
bnc#750263
logrotate complains about /var/log/news/ permissions
bnc#678434
VUL-1: klogd/inn: logrotate: issues with service owned directories
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