Update log4j 2.x

Change-Id: I028e6057344c3572c7e1a67d865cc6683cd25d5c
diff --git a/manager/pom.xml b/manager/pom.xml
index bb4fff9..4a210d8 100644
--- a/manager/pom.xml
+++ b/manager/pom.xml
@@ -17,6 +17,7 @@
 
 	<properties>
 		<java.version>1.8</java.version>
+		<log4j2.version>2.15.0</log4j2.version>
 	</properties>
 
     <licenses>