AMQP-396: set QOS even if queueDeclare fails

JIRA: https://jira.spring.io/browse/AMQP-396

* Some code cleanup
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AMQP-397 Explicit 'localhost' For All Tests

JIRA: https://jira.spring.io/browse/AMQP-397

Since Rabbit 3.3.0, the guest user is not allowed
to use interfaces other than the loopback (127.0.0.1).

Change all tests to explicitly use `localhost`.