Add missing Locale import

Author: holdenk

resource-managers/kubernetes/integration-tests/src/test/scala/org/apache/spark/deploy/k8s/integrationtest/SecretsTestsSuite.scala

@@ -16,6 +16,8 @@
  */
 package org.apache.spark.deploy.k8s.integrationtest
 
+import java.util.Locale
+
 import scala.collection.JavaConverters._
 
 import io.fabric8.kubernetes.api.model.{Pod, SecretBuilder}