XD-2216 Update Spring Framework, Integration, AMQP

JIRA: https://jira.spring.io/browse/XD-2216

- Update Spring Framework to 4.1.1
- Update Spring Integration to 4.1.0.BUILD-SNAPSHOT
   -- Required due to a number of bugs in 4.1.0.RC1; if Spring Framework slips beyond XD M1, we will create SI RC2
- Update Spring AMQP to 1.4.0.RC1
- Fix tests for changes in AMQP Header Mapper
- Switch to Jackson2
- Rename test `completion` package to `completionnoscan` (see JIRA comments).
- Fix deprecations