Produce an error if a TLS-PSK client tries to connect to a broker
that is not configured with TLS-PSK.

This would happen with a corrupt/crafted configuration file. Unless your
configuration file is writable by untrusted users this is not a risk.

Closes #567213. Thanks to Roland Sako.

Haiku build fixes

Signed-off-by: begasus <begasus@gmail.com>

This is so binary payloads are not modified when printing.

Thanks to Steve Mullock.

Closes #2224. Thanks to Luigi Caiffa.

If a MQTT v5 client connects with a crafted CONNECT packet a memory leak
will occur.

Thanks to Kathrin Kleinhammer.

Closes #2173. Thanks to Niclas Lindgren.

Closes #2172. Thanks to Niclas Lindgren.

Closes #2207. Thanks to Abilio Marques.

Coverity scan #1451483.