[geonetwork] add a logger config for org.geonetwork.security.external…

….integration (#407)

this way we cant see errors and warnings when sync fails...

(cherry picked from commit 02f9d0f)

geonetwork/log4j/log4j2.xml

@@ -82,6 +82,9 @@
     <Logger name="org.springframework.security.ldap" level="error"/>
     <Logger name="org.springframework.aop.framework.CglibAopProxy" level="error"/>
 
+    <!-- geOrchestra user/groups/roles synchronization -->
+    <Logger name="org.geonetwork.security.external.integration" level="warn"/>
+
     <Logger name="com.k_int" level="error" additivity="false">
       <AppenderRef ref="Console"/>
     </Logger>