ARTEMIS-2234 fix warning from LoggingConfigurationFileReloader

return the LogContextConfiguration if we have one

artemis-server/src/main/java/org/apache/activemq/artemis/core/server/LoggingConfigurationFileReloader.java

@@ -81,6 +81,9 @@ public class LoggingConfigurationFileReloader implements ReloadCallback {
       if (configurator instanceof PropertyConfigurator) {
          return ((PropertyConfigurator) configurator).getLogContextConfiguration();
       }
+      if (configurator instanceof LogContextConfiguration) {
+         return (LogContextConfiguration) configurator;
+      }
       return null;
    }
 }