Use web-application-type=reactive by default if webflux present

We want the default application type to be REACTIVE if webflux is
present (formerly it was NONE). In AWS and Azure we also want
the webflux beans to be switched off in a "lite" application
context (formerly they were unconditional).

spring-cloud-function-samples/function-sample-aws/src/test/java/example/MapTests.java

@@ -16,7 +16,6 @@
 
 package example;
 
-import org.junit.Ignore;
 import org.junit.Test;
 
 import org.springframework.cloud.function.adapter.aws.SpringBootRequestHandler;
@@ -27,7 +26,6 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Dave Syer
  *
  */
-@Ignore
 public class MapTests {
 
 	@Test