adjust log levels

Author: Vladimir Kotal

plugins/src/main/java/opengrok/auth/plugin/LdapFilterPlugin.java

@@ -134,16 +134,16 @@ public void fillSession(HttpServletRequest req, User user) {
         AbstractLdapProvider ldapProvider = getLdapProvider();
         try {
             if ((ldapProvider.lookupLdapContent(null, expandedFilter)) == null) {
-                LOGGER.log(Level.WARNING,
-                        "failed to get content for LDAP user {0} with filter ''{1}'' on {2}",
+                LOGGER.log(Level.FINER,
+                        "empty content for LDAP user {0} with filter ''{1}'' on {2}",
                         new Object[]{ldapUser, expandedFilter, ldapProvider});
                 return;
             }
         } catch (LdapException ex) {
             throw new AuthorizationException(ex);
         }
 
-        LOGGER.log(Level.FINEST, "LDAP user {0} allowed on {2}",
+        LOGGER.log(Level.FINER, "LDAP user {0} allowed on {2}",
                 new Object[]{ldapUser, ldapProvider});
         updateSession(req, true);
     }