fix checkstyle issue

com.baidu.hugegraph.traversal.algorithm.HugeTraverser.java
com.baidu.hugegraph.traversal.algorithm.JaccardSimilarTraverser.java
com.baidu.hugegraph.traversal.algorithm.OltpTraverser.java
com.baidu.hugegraph.traversal.algorithm.ShortestPathTraverser.java
com.baidu.hugegraph.traversal.algorithm.records.ShortestPathRecords.java
com.baidu.hugegraph.traversal.optimize.HugeScriptTraversal.java
com.baidu.hugegraph.traversal.optimize.TraversalUtil.java
com.baidu.hugegraph.type.HugeType.java
com.baidu.hugegraph.type.define.SerialEnum.java
com.baidu.hugegraph.util.ConfigUtil.java
com.baidu.hugegraph.util.Consumers.java
com.baidu.hugegraph.util.GZipUtil.java
com.baidu.hugegraph.util.KryoUtil.java
com.baidu.hugegraph.util.Reflection.java
com.baidu.hugegraph.util.collection.IntMap.java
com.baidu.hugegraph.util.collection.IntSet.java

com.baidu.hugegraph.unit.core.SerialEnumTest