Move integration test to correct package
Ensure tests fail if cookie used for header
SessionRepositoryFilter use HeaderHttpSessionStrategy

The @EnableRedisHttpSession creates its own SessionRepositoryFilter and
exposes it as a Bean. Spring Boot will automatically register Filters that
are exposed as Beans. This means this SessionRepositoryFilter will take
precidense over the SessionRepositoryFilter registered with Spring
Security. To customize this Filter, simply create a Bean that implements
HttpSessionStrategy.
Merge pull request #1 from rwinch/gh-spring-session-56

Fixes for spring-projects/spring-session#56