Requirements
============
You can build and install it like any other plugin (see
http://www.rabbitmq.com/plugin-development.html).
Documentation
=============
See http://www.rabbitmq.com/ldap.html
Limitations
===========
Currently this plugin is rather chatty with LDAP connections when
doing authorisation over LDAP - every time RabbitMQ needs to do an
authorisation query it starts a new LDAP connection. However, RabbitMQ
does have a per-channel authorisation cache, so this is not too awful.
There might need to be more types of queries.