Allow ConnectionConfig to use either URI or named parameters.

[drazzib]

AMQP URI is a nicer (at least in my PoV) way to configure complex RabbitMQ remote connections http://www.rabbitmq.com/uri-spec.html http://www.rabbitmq.com/uri-query-parameters.html

• Add new "rabbitmq.uri" parameter
• Return RuntimeException in case of malformed or invalid URI