attempt to fix standalone server startup test

Author: Brendan Doyle

core/monitoring/user-events/src/test/scala/org/apache/openwhisk/core/monitoring/metrics/KafkaSpecBase.scala

@@ -36,6 +36,7 @@ abstract class KafkaSpecBase
   implicit val timeoutConfig: PatienceConfig = PatienceConfig(5.minute)
   override val sleepAfterProduce: FiniteDuration = 10.seconds
   override protected val topicCreationTimeout = 120.seconds
+  override protected val producerPublishTimeout: FiniteDuration = 60.seconds
 
   lazy implicit val embeddedKafkaConfig: EmbeddedKafkaConfig = EmbeddedKafkaConfig(kafkaPort, zooKeeperPort)
 

core/standalone/src/main/scala/org/apache/openwhisk/standalone/KafkaLauncher.scala

@@ -105,6 +105,7 @@ class KafkaLauncher(
 
   private def createDir(name: String) = {
     val dir = new File(workDir, name)
+    FileUtils.forceDelete(dir)
     FileUtils.forceMkdir(dir)
     Directory(dir)
   }