Add back spring-cloud-function-web (faster startup)

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).

spring-cloud-function-deployer/src/main/java/org/springframework/cloud/function/deployer/ApplicationRunner.java

@@ -99,6 +99,7 @@ public class ApplicationRunner implements CommandLineRunner {
 		if (this.classLoader!=null && this.classLoader instanceof Closeable) {
 			((Closeable) this.classLoader).close();
 		}
+		this.classLoader = null;
 	}
 
 	private RuntimeException getError() {