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RabbitMQ v3_6_7 发布，AMQP消息服务器

RabbitMQ是实现AMQP（高级消息队列协议）的消息中间件的一种，最初起源于金融系统，用于在分布式系统中存储转发消息，在易用性、扩展性、高可用性等方面表现不俗。消息中间件主要用于组件之间的解耦，消息的发送者无需知道消息使用者的存在，反之亦然。

AMQP 里主要要说两个组件：Exchange 和 Queue （在 AMQP 1.0 里还会有变动），如下图所示，绿色的 X 就是 Exchange ，红色的是 Queue ，这两者都在 Server 端，又称作 Broker ，这部分是 RabbitMQ 实现的，而蓝色的则是客户端，通常有 Producer 和 Consumer 两种类型。

更新日志

Bug 修复

Queue master process could terminate with a {bad_match, {error, not_found}} error.

GitHub issue: rabbitmq-server#1035
rabbitmq-service.bat should exit with a non-0 code when installation fails.

GitHub issue: rabbitmq-server#1052
rabbitmqctl stop_app now produces a more technically correct output about
what the operation does.

GitHub issue: rabbitmq-server#1043

Enhancements

Nodes in a cluster now can be restared in arbitrary order. They will attempt to contact
one of the previously seen peers periodically (10 times with 30 second intervals by default).

GitHub issue: rabbitmq-server#1033
Increased credit flow default settings, background GC is disabled by default
for more predictable latency.

GitHub issue: rabbitmq-server#1098
TLS listeners now support SNI (via Ranch 1.3.0).

GitHub issue: rabbitmq-server#789
Successful connection authentication now leaves additional log entries, just like authentication
failures. It is now easier to see from the log what user connected to what vhost.

GitHub issue: rabbitmq-server#1140
Internal authentication backend now supports credential validators.

GitHub issue: rabbitmq-server#1054
Worker process shutdown timeout now can be configured.

GitHub issue: rabbitmq-server#847
Default Erlang VM ETS limit was increased from 1400 to 50000. This is necessary to support
a larger number of virtual hosts with the new management plugin.

GitHub issue: rabbitmq-server#1059
RABBITMQ_PLUGINS_DIR now supports multiple directories (colon-separated on Linux and other UNIX-like
platforms, semicolon-separated on Windows).

Contributed by Alexey Lebedeff.

GitHub issue: rabbitmq-server#1001
Background GC now can be disabled and configured to use a different target interval value.
Original patch by Tim Stewart.

GitHub issue: rabbitmq-server#1026
L-prefixed (long-long-int) attribute table (header) keys are now accepted by the parser.

GitHub issue: rabbitmq-server#1093