Security update for avahi

This update for avahi fixes the following issues:

- CVE-2021-3468: avoid infinite loop by handling HUP event in client_work (bsc#1184521).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1184521
VUL-0: CVE-2021-3468: avahi: local DoS by event-busy-loop from writing long lines to /run/avahi-daemon/socket
Selected Binaries
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