Closes #1174. Thanks to beville.

Bug: https://github.com/eclipse/mosquitto/issues/1174

Closes #1032. Thanks to jkoopman, Joseph Benden and Ari Suutari.

Bug: https://github.com/eclipse/mosquitto/issues/1032

1398654, 1398656 - lib missing unlock on fatal protocol error
1398655 - broker potential double free on startup after fatal persist
          error.

Follow-up of 70c4097b

.

Signed-off-by: Timo Gurr <timo.gurr@gmail.com>

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.