[MINOR] Fix Java style errors and remove unused imports

Fix Java style errors and remove unused imports, which are randomly found

Tested on my local machine.

Author: Xin Ren <[email protected]>

Closes #14161 from keypointt/SPARK-16437.

(cherry picked from commit f73891e)
Signed-off-by: Sean Owen <[email protected]>

Author: keypointt

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFileFormat.scala

@@ -778,8 +778,7 @@ private[sql] object ParquetFileFormat extends Logging {
     val assumeBinaryIsString = sparkSession.sessionState.conf.isParquetBinaryAsString
     val assumeInt96IsTimestamp = sparkSession.sessionState.conf.isParquetINT96AsTimestamp
     val writeLegacyParquetFormat = sparkSession.sessionState.conf.writeLegacyParquetFormat
-    val serializedConf =
-      new SerializableConfiguration(sparkSession.sessionState.newHadoopConf())
+    val serializedConf = new SerializableConfiguration(sparkSession.sessionState.newHadoopConf())
 
     // !! HACK ALERT !!
     //

sql/core/src/test/scala/org/apache/spark/sql/sources/DataSourceTest.scala

@@ -18,7 +18,6 @@
 package org.apache.spark.sql.sources
 
 import org.apache.spark.sql._
-import org.apache.spark.sql.internal.SQLConf
 
 private[sql] abstract class DataSourceTest extends QueryTest {