Reduce log4j2 level for integration tests to ERROR

Otherwise there is lots of output that is likely rarely useful. 

This can be changed locally for testing easily whenever necessary.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1911516 13f79535-47bb-0310-9956-ffa450edef68

poi-integration/src/test/resources/log4j2-test.xml

@@ -39,7 +39,7 @@
     <Logger name="org.apache.poi.hslf.record.Record" level="ERROR" />
 
     <!-- Change to DEBUG or another level to get log output -->
-    <Root level="DEBUG">
+    <Root level="ERROR">
       <AppenderRef ref="Console" />
     </Root>
   </Loggers>