[MINOR] Remove unused imports and some other checkstyle issues (#2800)

hudi-integ-test/src/test/java/org/apache/hudi/integ/HoodieTestHiveBase.java

@@ -77,7 +77,7 @@ public class HoodieTestHiveBase extends ITTestBase {
         tableType, hiveTableName, commitType, hoodieTableName);
     if (partitionType == PartitionType.MULTI_KEYS_PARTITIONED) {
       cmd = cmd + " --use-multi-partition-keys";
-    } else if (partitionType == PartitionType.NON_PARTITIONED){
+    } else if (partitionType == PartitionType.NON_PARTITIONED) {
       cmd = cmd + " --non-partitioned";
     }
     executeCommandStringInDocker(ADHOC_1_CONTAINER, cmd, true);

hudi-integ-test/src/test/java/org/apache/hudi/integ/ITTestBase.java

@@ -166,7 +166,7 @@ public abstract class ITTestBase {
     // try to capture stdout and stderr of the stuck process.
 
     boolean completed =
-      dockerClient.execStartCmd(createCmdResponse.getId()).withDetach(false).withTty(false).exec(callback)
+        dockerClient.execStartCmd(createCmdResponse.getId()).withDetach(false).withTty(false).exec(callback)
         .awaitCompletion(540, SECONDS);
     if (!completed) {
       callback.getStderr().flush();

hudi-integ-test/src/test/java/org/apache/hudi/integ/testsuite/converter/TestDeleteConverter.java

@@ -28,7 +28,6 @@ import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 

hudi-integ-test/src/test/java/org/apache/hudi/integ/testsuite/converter/TestUpdateConverter.java

@@ -20,7 +20,6 @@ package org.apache.hudi.integ.testsuite.converter;
 
 import static junit.framework.TestCase.assertTrue;
 
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;