Try fixing remaining failures

- don't use SLF4j in HazelcastFaultToleranceTest
- set multicast discovery enabled property to true (default in HZ4 but not in HZ5)

Signed-off-by: Thomas Segismont <tsegismont@gmail.com>

src/test/java/io/vertx/core/ProgrammaticHazelcastClusterManagerTest.java

@@ -79,6 +79,7 @@ private Config createConfig() {
       .setProperty("hazelcast.wait.seconds.before.join", "0")
       .setProperty("hazelcast.local.localAddress", "127.0.0.1")
       .setClusterName(System.getProperty("vertx.hazelcast.test.group.name"));
+    config.getNetworkConfig().getJoin().getMulticastConfig().setEnabled(true);
     config.getMemberAttributeConfig().setAttribute("__vertx.nodeId", UUID.randomUUID().toString());
     return config;
   }

src/test/java/io/vertx/core/eventbus/HazelcastFaultToleranceTest.java

@@ -47,8 +47,6 @@ protected ClusterManager getClusterManager() {
   @Override
   protected List<String> getExternalNodeSystemProperties() {
     return Arrays.asList(
-      "-Dvertx.logger-delegate-factory-class-name=io.vertx.core.logging.SLF4JLogDelegateFactory",
-      "-Dhazelcast.logging.type=slf4j",
       "-Djava.net.preferIPv4Stack=true",
       "-Dvertx.hazelcast.test.group.name=" + groupName
     );