build: add log4j-over-slf4j to reroute log4j messages

pom.xml

@@ -225,6 +225,11 @@
             <artifactId>slf4j-api</artifactId>
             <version>1.6.0</version>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>log4j-over-slf4j</artifactId>
+            <version>1.6.0</version>
+        </dependency>
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
@@ -298,4 +303,4 @@
             <url>http://www.dcache.org/nexus/content/repositories/snapshots</url>
         </snapshotRepository>
     </distributionManagement>
-</project>
\ No newline at end of file
+</project>