Tell Hazelcast to use SLF4j for logging
diff --git a/conf/hazelcast.xml b/conf/hazelcast.xml
index 267cd58..11bef59 100644
--- a/conf/hazelcast.xml
+++ b/conf/hazelcast.xml
@@ -99,4 +99,7 @@
     </join>
   </network>
 
+  <properties>
+    <property name="hazelcast.logging.type">slf4j</property>
+  </properties>
 </hazelcast>