Fixes #575, make the resource leak detector initialized at runtime

Otherwise if a buffer was registered with the leak detector it is possible
for the native image build to fail randomly

extensions/vertx/deployment/src/main/java/org/jboss/shamrock/vertx/VertxProcessor.java

@@ -55,7 +55,8 @@ SubstrateConfigBuildItem build() {
                 .addRuntimeInitializedClass("io.netty.handler.codec.http.websocketx.WebSocket00FrameEncoder")
                 .addRuntimeInitializedClass("io.netty.handler.ssl.JdkNpnApplicationProtocolNegotiator")
                 .addRuntimeInitializedClass("io.netty.handler.ssl.ReferenceCountedOpenSslEngine")
-
+                .addRuntimeInitializedClass("io.netty.util.ResourceLeakDetector")
+                .addNativeImageSystemProperty("io.netty.leakDetection.level", "DISABLED") //TODO: make configurable
                 .build();
     }