Update to Spring AMQP 1.3.4, Groovy 2.3.1

Also change rabbit tests to use "localhost" explicitly;
newer brokers don't allow guest except on localhost.
[artifactory-release] Release version 4.0.2.RELEASE
[artifactory-release] Next development version
INT-3431: Fix `RecipientListRouter.onInit()`

JIRA: https://jira.spring.io/browse/INT-3431

The introduced `late channel resolution by name` via https://jira.spring.io/browse/INT-3431
has lost `onInit()` propagation from `RecipientListRouter.onInit()`