HADOOP-15277. Remove .FluentPropertyBeanIntrospector from CLI operation log output.

Contributed by Steve Loughran.

hadoop-common-project/hadoop-common/src/main/conf/log4j.properties

@@ -306,3 +306,6 @@ log4j.appender.EWMA.maxUniqueMessages=${yarn.ewma.maxUniqueMessages}
 #log4j.appender.FSSTATEDUMP.layout.ConversionPattern=%d{ISO8601} %p %c: %m%n
 #log4j.appender.FSSTATEDUMP.MaxFileSize=${hadoop.log.maxfilesize}
 #log4j.appender.FSSTATEDUMP.MaxBackupIndex=${hadoop.log.maxbackupindex}
+
+# Log levels of third-party libraries
+log4j.logger.org.apache.commons.beanutils=WARN