This only affects the case where a client connects using a username, and
the anonymous ACL list is defined but specific user ACLs are not
defined.

Closes #1162. Thanks to quonb.

This was leaving dangling messages that were never freed.

Closes #389. Thanks to pjchx.

Closes #1154. Thanks to Guzoft.

This now returns MOSQ_ERR_INVAL as expected.

Thanks to momoskitto.

Produce error if this is not the case. Closes #1164, thanks to
momoskitto.

Closes #1144. Thanks to Kris Mattheus.

This occurred when per_listener_settings was set to true.

Closes #1081. Thanks to dwin-wangjt.

Closes #1137. Thanks to Kris Mattheus.

Closes #1143. Thanks to salcedo.

Closes #1080. Thanks to lcouz.

Closes #1131. Thanks to beville.

Closes #1139. Huge thanks to Chris Mayo.

Closes #1134. Thanks to Adrian P.

Without this, mosquitto doesn't build on FreeBSD with websockets enabled

Signed-off-by: Steven Lawrance <stl@koffein.net>

For example, a QoS1 PUBLISH with QoS2 reply.

Thanks to Matthias Stone.

Previous behaviour would clear the external SSL_CTX provided by
MOSQ_OPT_SSL_CTX. This required the user to reset the SSL_CTX every
disconnect, and trust that they were not leaking references.

Recreating the SSL context for every connection is not necessary, and the
SSL context is freed in mosquitto_destroy, which is sufficient.

Signed-off-by: Matthias Stone <matthias@bellstone.ca>

Thanks to Mark Oeltjenbruns.