When a durable client reconnects, its queued messages are now checked against ACLs in case of a change in username/ACL state since it last connected.

Thanks to "web1".

Fix callback deadlocks after calling mosquitto_disconnect(), when using the threaded interfaces. Closes bug #1313725.

Thanks to Michael Frommberger.

Thanks to Frank Pagliughi.

Change-Id: Ib59fc8b213015fd21d32bf731a67719c64d7d3ec
Signed-off-by: Bart Van Der Meerssche <bart@flukso.net>

Change-Id: Ic874a92b79b32b4ebd2b8130fefe2b31fddd43b6
Signed-off-by: Bart Van Der Meerssche <bart@flukso.net>

Thanks to JP Mens.

Conflicts:
	ChangeLog.txt

Fix subscriptions being deleted when clients subscribed to a topic
beginning with a $ but that is not $SYS.

Thanks to David Woodward.

Crash may occur for ACLs that do not include a %u and clients that
connect without a username.

Thanks to Karl Palsson.

Thanks to Tobias Assarsson.

Thanks to Stefan Borsje.