[rabbitmq] Begin backporting RabbitMQ input and output implementations from 1.2
[rabbitmq] Adapt HotBunnies input implementation for 1.1.x
[rabbitmq] Make Bunny and HotBunnies recovery in the output consistent
[rabbitmq] Adapt Bunny input impl for 1.1.x
[rabbitmq] Use consistent log messages across implementations
Merge pull request #566 from michaelklishin/backport_rabbitmq_plugin_to_1_1

Backport rabbitmq plugin to 1.1.x