remove unused import

Author: jiangpengcheng

tests/src/test/scala/org/apache/openwhisk/core/loadBalancer/test/InvokerSupervisionTests.scala

@@ -21,7 +21,6 @@ import scala.collection.mutable
 import scala.concurrent.Await
 import scala.concurrent.duration._
 import scala.concurrent.Future
-import org.apache.kafka.common.TopicPartition
 import org.junit.runner.RunWith
 import org.scalamock.scalatest.MockFactory
 import org.scalatest.BeforeAndAfterAll

tests/src/test/scala/org/apache/openwhisk/core/loadBalancer/test/ShardingContainerPoolBalancerTests.scala

@@ -24,7 +24,6 @@ import akka.testkit.TestProbe
 import common.{StreamLogging, WhiskProperties}
 
 import java.nio.charset.StandardCharsets
-import org.apache.kafka.common.TopicPartition
 import org.apache.openwhisk.common.InvokerState.{Healthy, Offline, Unhealthy}
 import org.junit.runner.RunWith
 import org.scalamock.scalatest.MockFactory

tests/src/test/scala/org/apache/openwhisk/core/scheduler/container/test/ContainerManagerTests.scala

@@ -22,7 +22,6 @@ import akka.actor.{ActorRef, ActorRefFactory, ActorSystem}
 import akka.testkit.{ImplicitSender, TestKit, TestProbe}
 import com.ibm.etcd.api.{KeyValue, RangeResponse}
 import common.{StreamLogging, WskActorSystem}
-import org.apache.kafka.common.TopicPartition
 import org.apache.openwhisk.common.InvokerState.{Healthy, Unhealthy}
 import org.apache.openwhisk.common.{GracefulShutdown, InvokerHealth, Logging, TransactionId}
 import org.apache.openwhisk.core.connector.ContainerCreationError.{