[SPARK-4131] Merge HiveTmpFile.scala to SaveAsHiveFile.scala

## What changes were proposed in this pull request?

The code is already merged to master:
apache#18975

This is a following up PR to merge HiveTmpFile.scala to SaveAsHiveFile.

## How was this patch tested?

Build successfully

Author: Jane Wang <[email protected]>

Closes apache#19221 from janewangfb/merge_savehivefile_hivetmpfile.

Author: janewangfb

sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTmpPath.scala

@@ -55,7 +55,7 @@ case class InsertIntoHiveDirCommand(
     isLocal: Boolean,
     storage: CatalogStorageFormat,
     query: LogicalPlan,
-    overwrite: Boolean) extends SaveAsHiveFile with HiveTmpPath {
+    overwrite: Boolean) extends SaveAsHiveFile {
 
   override def children: Seq[LogicalPlan] = query :: Nil
 

sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/InsertIntoHiveDirCommand.scala

@@ -70,7 +70,7 @@ case class InsertIntoHiveTable(
     partition: Map[String, Option[String]],
     query: LogicalPlan,
     overwrite: Boolean,
-    ifPartitionNotExists: Boolean) extends SaveAsHiveFile with HiveTmpPath {
+    ifPartitionNotExists: Boolean) extends SaveAsHiveFile {
 
   override def children: Seq[LogicalPlan] = query :: Nil