User can run a minimal HTTP app using an app that is a Function
or an ApplicationContextInitializer. Can also test using
@FunctionalSpringBootTest in place of @SpringBootTest.
Add some tests and documentation for functional beans
Make server.address configurable
MVC and Webflux share some common business logic
so it makes sense to put them in the same module.
Also simplifies the MVC code, removing the custom argument
and return value handlers.
Weed out unecessary method param
Unignore some tests
With this change there are now 2 choices for web endpoints. The
stream servlet binder is useful for multi-binder use cases
(e.g. HTTP -> message broker).
Make it deployable via its maven coordinates in
spring-cloud-function-deployer (it is deployed by default on start
up right now, but that's just a demo)
