fix checkstyel issue

com.baidu.hugegraph.HugeFactory.java
com.baidu.hugegraph.HugeGraph.java
com.baidu.hugegraph.HugeGraphParams.java
com.baidu.hugegraph.StandardHugeGraph.java
com.baidu.hugegraph.io.HugeGraphSONModule.java
com.baidu.hugegraph.job.computer.AbstractComputer.java
com.baidu.hugegraph.job.computer.LouvainComputer.java
com.baidu.hugegraph.job.system.DeleteExpiredIndexJob.java
com.baidu.hugegraph.plugin.HugeGraphGremlinPlugin.java
com.baidu.hugegraph.schema.builder.PropertyKeyBuilder.java
com.baidu.hugegraph.security.HugeSecurityManager.java
com.baidu.hugegraph.task.HugeTask.java
com.baidu.hugegraph.task.TaskManager.java
com.baidu.hugegraph.task.TaskScheduler.java