[HOT][BUILD] Changed the import order

This PR is to fix the master's build break.

The following tests failed due to the import order issues in the master.
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/49651/consoleFull
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/49652/consoleFull
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/49653/consoleFull

Author: gatorsmile <gatorsmile@gmail.com>

Closes #10823 from gatorsmile/importOrder.

sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala

@@ -17,7 +17,6 @@
 
 package org.apache.spark.sql.execution
 
-import org.apache.spark.sql.execution.joins.{BuildLeft, BuildRight}
 import org.apache.spark.sql.{execution, Strategy}
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.expressions._
@@ -29,6 +28,7 @@ import org.apache.spark.sql.catalyst.plans.physical._
 import org.apache.spark.sql.execution.{DescribeCommand => RunnableDescribeCommand}
 import org.apache.spark.sql.execution.columnar.{InMemoryColumnarTableScan, InMemoryRelation}
 import org.apache.spark.sql.execution.datasources.{CreateTableUsing, CreateTempTableUsing, DescribeCommand => LogicalDescribeCommand, _}
+import org.apache.spark.sql.execution.joins.{BuildLeft, BuildRight}
 
 private[sql] abstract class SparkStrategies extends QueryPlanner[SparkPlan] {
   self: SparkPlanner =>

sql/core/src/test/scala/org/apache/spark/sql/execution/joins/InnerJoinSuite.scala

@@ -17,6 +17,7 @@
 
 package org.apache.spark.sql.execution.joins
 
+import org.apache.spark.sql.{DataFrame, Row, SQLConf}
 import org.apache.spark.sql.catalyst.expressions.Expression
 import org.apache.spark.sql.catalyst.planning.ExtractEquiJoinKeys
 import org.apache.spark.sql.catalyst.plans.Inner
@@ -24,7 +25,6 @@ import org.apache.spark.sql.catalyst.plans.logical.Join
 import org.apache.spark.sql.execution._
 import org.apache.spark.sql.test.SharedSQLContext
 import org.apache.spark.sql.types.{IntegerType, StringType, StructType}
-import org.apache.spark.sql.{DataFrame, Row, SQLConf}
 
 class InnerJoinSuite extends SparkPlanTest with SharedSQLContext {
   import testImplicits.localSeqToDataFrameHolder