Fix incompatibility to TestClusterAware api change (#2163) (#2164)

(cherry picked from commit 36c46e4)

Author: breskeby

buildSrc/src/main/groovy/org/elasticsearch/hadoop/gradle/fixture/hadoop/tasks/DfsCopy.groovy

@@ -27,7 +27,7 @@ import org.gradle.api.file.CopySpec
 import org.gradle.api.tasks.TaskAction
 import org.gradle.process.ExecSpec
 
-class DfsCopy extends AbstractClusterTask {
+abstract class DfsCopy extends AbstractClusterTask {
 
     File dfsSource
     File localSource

buildSrc/src/main/groovy/org/elasticsearch/hadoop/gradle/fixture/hadoop/tasks/HadoopMRJob.groovy

@@ -31,7 +31,7 @@ import org.gradle.process.ExecSpec
 
 import static org.elasticsearch.hadoop.gradle.util.ObjectUtil.unapplyString
 
-class HadoopMRJob extends AbstractClusterTask {
+abstract class HadoopMRJob extends AbstractClusterTask {
 
     @Input
     String jobClass

buildSrc/src/main/groovy/org/elasticsearch/hadoop/gradle/fixture/hadoop/tasks/HiveBeeline.groovy

@@ -31,7 +31,7 @@ import org.gradle.process.ExecSpec
 
 import static org.elasticsearch.hadoop.gradle.fixture.hadoop.conf.SettingsContainer.FileSettings
 
-class HiveBeeline extends AbstractClusterTask {
+abstract class HiveBeeline extends AbstractClusterTask {
 
     @InputFile
     File script

buildSrc/src/main/groovy/org/elasticsearch/hadoop/gradle/fixture/hadoop/tasks/SparkApp.groovy

@@ -33,7 +33,7 @@ import org.gradle.process.ExecSpec
 
 import static org.elasticsearch.hadoop.gradle.util.ObjectUtil.unapplyString
 
-class SparkApp extends AbstractClusterTask {
+abstract class SparkApp extends AbstractClusterTask {
 
     enum Master {
         LOCAL, YARN, STANDALONE