Fixesspring-cloud/spring-cloud-stream#1569
When `inheritEnvironment = true` (default), some provided properties
(including `spring.main.sources`) are not populated into the target
binder's environment, since Spring Boot relies on the presence of
the `configurationProperties` properties source which is transferred
from the parent context
* Remove `configurationProperties` from the `binderEnvironment` before
starting binder's application context
* Ensure that `spring.main.sources` is applied for the binder's
application context in the `BinderFactoryConfigurationTests`
* Fix `GreenfieldFunctionEnableBindingTests` for random HTTP port since
`8080` is too generic and clashes with build environment
* Fix `StreamListenerAnnotatedMethodArgumentsTests` for `Locale.US`
for proper assertion against validation message
* Mention `spring.profiles.active` configuration property for the
binder specific environment
460ba9cecb