SPARKC-621 adjust ccm it test runner to DSE 6.8.5

CCM places metadata directory for DSE 6.8.5 and up in
/var/lib/cassandra/metadata. This is invalid as the dir is not
accessible.

Author: jtgrabowski

test-support/src/main/scala/com/datastax/spark/connector/ccm/CcmConfig.scala

@@ -116,6 +116,7 @@ object CcmConfig {
   val DEFAULT_SERVER_LOCALHOST_KEYSTORE_PATH: String = "/server_localhost.keystore"
 
   // DSE versions
+  val V6_8_5: Version = Version.parse("6.8.5")
   val V6_8_3: Version = Version.parse("6.8.3")
   val V6_8_0: Version = Version.parse("6.8.0")
   val V6_7_0: Version = Version.parse("6.7.0")

test-support/src/main/scala/com/datastax/spark/connector/ccm/mode/StandardModeExecutor.scala

@@ -6,10 +6,9 @@ import java.util.concurrent.atomic.AtomicBoolean
 
 import com.datastax.oss.driver.api.core.Version
 import com.datastax.spark.connector.ccm.CcmConfig
+import com.datastax.spark.connector.ccm.CcmConfig.V6_8_5
 import org.slf4j.{Logger, LoggerFactory}
 
-import scala.collection.JavaConverters._
-
 private[mode] trait DefaultExecutor extends ClusterModeExecutor {
   private val logger: Logger = LoggerFactory.getLogger(classOf[StandardModeExecutor])
 
@@ -91,6 +90,10 @@ private[mode] trait DefaultExecutor extends ClusterModeExecutor {
           s"node$i"
 
         execute(addArgs: _*)
+
+        if (config.dseEnabled && config.getDseVersion.exists(_.compareTo(V6_8_5) >= 0)) {
+          execute("updateconf", s"metadata_directory:${dir.toFile.getAbsolutePath}/metadata$i")
+        }
       }
 
       config.cassandraConfiguration.foreach { case (key, value) =>