DSL: Fix @Autowired issue for IntegrationFlows

* Move DSL parser logic from `BFPP` to `BPP` as soon as the DSL doesn't populate any `BeanDefinition` - just real objects,
which can be registered with `this.beanFactory.registerSingleton(beanName, component);`
* Add more DSL for `Amqp` 'Namespace' factory and provide tests on the matter
* Comment out `spring-integration-jdbc` and `spring-integration-jpa` dependecies because the provide `spring-jdbc` dependency,
but it causes an issue in Boot: https://github.com/spring-projects/spring-boot/issues/1041

spring-integration-java-dsl/build.gradle

@@ -54,10 +54,10 @@ dependencies {
 	 , 'spring-integration-ftp'
 	 , 'spring-integration-gemfire'
 	 , 'spring-integration-http'
-	 , 'spring-integration-jdbc'
+//	 , 'spring-integration-jdbc'
 	 , 'spring-integration-jms'
 	 , 'spring-integration-jmx'
-	 , 'spring-integration-jpa'
+//	 , 'spring-integration-jpa'
 	 , 'spring-integration-mail'
 	 , 'spring-integration-mongodb'
 	 , 'spring-integration-mqtt'