JIRA: https://jira.spring.io/browse/INT-2791
* Add `template-channel-transacted` attribute for the `<amqp:channel>`s to separate configuration for
container and RabbitTemplate
* Make container's `channelTransacted` as `false` by default
* Upgrade to `S-AMQP-1.4.0`
* Add `AmqpHeaders.PUBLISH_CONFIRM_NACK_CAUSE` according to the new `RabbitTemplate.ConfirmCallback#confirm` signature
Conflicts:
src/reference/docbook/whats-new.xml
Conflicts:
src/reference/docbook/whats-new.xml
INT-2791: Polishing
Upgrade to S-AMQP-2.0
Fix for mock publisher confirm/return tests, since `channel` is now physically closed, if the `ConnectionFactory` isn't `CachingConnectionFactory`
d43b89dedc