Disable Reactor Netty's use of kqueue/epoll

There is a suspicion that the use of epoll is causing the intermittent
failures being tracked by gh-10569. This commit disables the use of
epoll to see if it improves the situation.

See gh-10569

Author: wilkinsona

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/netty/NettyReactiveWebServerFactory.java

@@ -97,6 +97,7 @@ private HttpServer createHttpServer() {
 			if (getCompression() != null && getCompression().getEnabled()) {
 				options.compression(getCompression().getMinResponseSize());
 			}
+			options.preferNative(false);
 			applyCustomizers(options);
 		}).build();
 	}