OPENOLAT-513: added log4j-extras dependency to be able to use the RollingFileAppender

pom.xml

@@ -400,6 +400,11 @@
 					<artifactId>log4j</artifactId>
 					<version>1.2.17</version>
 				</dependency>
+				<dependency>
+					<groupId>log4j</groupId>
+					<artifactId>apache-log4j-extras</artifactId>
+					<version>1.2.17</version>
+				</dependency>
 				<!-- Jersey for tomcat -->
 				<dependency>
 					<groupId>javax.ws.rs</groupId>