Change from Apache Http Client to Reactor Netty.

Provide followRedirect to remove Authorization.

Fixes spring-attic#5989

Author: Corneil du Plessis

spring-cloud-dataflow-configuration-metadata/src/test/java/org/springframework/cloud/dataflow/container/registry/authorization/DropAuthorizationHeaderOnInsecureS3RequestRedirectStrategyTest.java

@@ -23,8 +23,6 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtensionContext;
-import org.junit.jupiter.api.extension.RegisterExtension;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;