SUSE-SU-2021:0551-1 Security update for avahi

This update for avahi fixes the following issues: - CVE-2021-26720: drop privileges when invoking avahi-daemon-check-dns.sh bsc1180827 - Update avahi-daemon-check-dns.sh from Debian. Our previous version relied on ifconfig, route, and init.d. - Add sudo to requires: used to drop privileges...