replace AsyncAssertions.Waite with Waiters.Waiter in scala tests

Author: mgaido91

sql/core/src/test/scala/org/apache/spark/sql/execution/streaming/HDFSMetadataLogSuite.scala

@@ -26,10 +26,10 @@ import scala.util.Random
 
 import org.apache.hadoop.conf.Configuration
 import org.apache.hadoop.fs._
-import org.scalatest.concurrent.AsyncAssertions._
+import org.scalatest.concurrent.Waiters._
 import org.scalatest.time.SpanSugar._
 
-import org.apache.spark.{SparkConf, SparkFunSuite}
+import org.apache.spark.SparkFunSuite
 import org.apache.spark.sql.execution.streaming.FakeFileSystem._
 import org.apache.spark.sql.execution.streaming.HDFSMetadataLog.{FileContextManager, FileManager, FileSystemManager}
 import org.apache.spark.sql.test.SharedSQLContext

sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamingQueryListenerSuite.scala

@@ -25,8 +25,8 @@ import scala.language.reflectiveCalls
 import org.scalactic.TolerantNumerics
 import org.scalatest.BeforeAndAfter
 import org.scalatest.PrivateMethodTester._
-import org.scalatest.concurrent.AsyncAssertions.Waiter
 import org.scalatest.concurrent.PatienceConfiguration.Timeout
+import org.scalatest.concurrent.Waiters.Waiter
 
 import org.apache.spark.SparkException
 import org.apache.spark.scheduler._