[18.09] mosquitto: 1.4.15 -> 1.5.3 #49186
Merged
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Motivation for this change
This is a backport of changes from master that fix several security issues that did arise in the mosquitto MQTT server.
I read through the changelog and it doesn't seem to introduce any breaking changes. There are many bugfixes. One fix on timeout behavior could be seen as breakage but AFAIK that was on an edge case and can probably be let through.
cc release managers for 18.09 @samueldr @vcunat
Things done
[X] Recompiled using sandboxing on NixOS