Version 2.0.9 released.

Versions 2.0.9, 1.6.14, and 1.5.11 of Mosquitto have been released. These are
bugfix releases and include a minor security fix.

2.0.9

If an empty or invalid CA file was provided to the client library for
verifying the remote broker, then the initial connection would fail but
subsequent connections would succeed without verifying the remote broker
certificate. Closes #2130.
If an empty or invalid CA file was provided to the broker for verifying the
remote broker for an outgoing bridge connection then the initial connection
would fail but subsequent connections would succeed without verifying the
remote broker certificate. Closes #2130.

Fix encrypted bridge connections incorrectly connecting when bridge_cafile
is empty or invalid. Closes #2130.
Fix tls_version behaviour not matching documentation. It was setting the
exact TLS version to use, not the minimium TLS version to use. Closes #2110.
Fix messages to $ prefixed topics being rejected. Closes #2111.
Fix QoS 0 messages not being delivered when max_queued_bytes was configured.
Closes #2123.
Fix bridge increasing backoff calculation.
Improve handling of invalid combinations of listener address and bind
interface configurations. Closes #2081.
Fix max_keepalive option not applying to clients connecting with keepalive
set to 0. Closes #2117.

Fix encrypted connections incorrectly connecting when the CA file passed to
mosquitto_tls_set() is empty or invalid. Closes #2130.
Fix connections retrying very rapidly in some situations.

If an empty or invalid CA file was provided to the client library for
verifying the remote broker, then the initial connection would fail but
subsequent connections would succeed without verifying the remote broker
certificate. Closes #2130.
If an empty or invalid CA file was provided to the broker for verifying the
remote broker for an outgoing bridge connection then the initial connection
would fail but subsequent connections would succeed without verifying the
remote broker certificate. Closes #2130.

Fix encrypted bridge connections incorrectly connecting when bridge_cafile
is empty or invalid. Closes #2130.

Fix encrypted connections incorrectly connecting when the CA file passed to
mosquitto_tls_set() is empty or invalid. Closes #2130.
Fix connections retrying very rapidly in some situations.

Fix possible loss of data in mosquitto_pub -l when sending multiple long
lines. Closes #2078.

If an empty or invalid CA file was provided to the client library for
verifying the remote broker, then the initial connection would fail but
subsequent connections would succeed without verifying the remote broker
certificate. Closes #2130.
If an empty or invalid CA file was provided to the broker for verifying the
remote broker for an outgoing bridge connection then the initial connection
would fail but subsequent connections would succeed without verifying the
remote broker certificate. Closes #2130.

Fix encrypted bridge connections incorrectly connecting when bridge_cafile
is empty or invalid. Closes #2130.

Fix encrypted connections incorrectly connecting when the CA file passed to
mosquitto_tls_set() is empty or invalid. Closes #2130.