fix code style

Author: Nicole00

client/src/main/java/com/vesoft/nebula/client/storage/StorageClient.java

@@ -25,7 +25,6 @@
 import com.vesoft.nebula.storage.ScanEdgeRequest;
 import com.vesoft.nebula.storage.ScanVertexRequest;
 import com.vesoft.nebula.storage.VertexProp;
-
 import java.io.Serializable;
 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
@@ -35,7 +34,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

client/src/test/java/com/vesoft/nebula/client/storage/StorageClientTest.java

@@ -18,12 +18,10 @@
 import com.vesoft.nebula.client.storage.scan.ScanVertexResult;
 import com.vesoft.nebula.client.storage.scan.ScanVertexResultIterator;
 import com.vesoft.nebula.client.util.ProcessUtil;
-
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 import java.util.Arrays;
 import java.util.List;
-
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;