VXQUERY-194: Moved HDFS created test files to target

Also automatically delete these files after the tests
diff --git a/vxquery-xtest/src/main/java/org/apache/vxquery/xtest/MiniDFS.java b/vxquery-xtest/src/main/java/org/apache/vxquery/xtest/MiniDFS.java
index a675150..345a6b5 100644
--- a/vxquery-xtest/src/main/java/org/apache/vxquery/xtest/MiniDFS.java
+++ b/vxquery-xtest/src/main/java/org/apache/vxquery/xtest/MiniDFS.java
@@ -18,7 +18,6 @@
 
 import java.io.IOException;
 
-import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
@@ -31,9 +30,8 @@
     private static final String PATH_TO_HADOOP_CONF = "src/test/resources/hadoop/conf";
     private static final String DATA_PATH = "src/test/resources/TestSources/ghcnd";
 
-    public void startHDFS() throws IOException {
+    public void startHDFS(String folder) throws IOException {
 
-        FileSystem lfs = FileSystem.getLocal(new Configuration());
         JobConf conf = new JobConf();
         conf.addResource(new Path(PATH_TO_HADOOP_CONF + "/core-site.xml"));
         conf.addResource(new Path(PATH_TO_HADOOP_CONF + "/mapred-site.xml"));
@@ -41,9 +39,8 @@
         int numDataNodes = 1;
         int nameNodePort = 40000;
 
-        // cleanup artifacts created on the local file system
-        lfs.delete(new Path("build"), true);
         System.setProperty("hadoop.log.dir", "logs");
+        System.setProperty("test.build.data", folder.concat("/"));
         MiniDFSCluster.Builder build = new MiniDFSCluster.Builder(conf);
         build.nameNodePort(nameNodePort);
         build.nameNodeHttpPort(nameNodePort + 34);
diff --git a/vxquery-xtest/src/test/java/org/apache/vxquery/xtest/VXQueryTest.java b/vxquery-xtest/src/test/java/org/apache/vxquery/xtest/VXQueryTest.java
index 11f7eb2..3679aba 100644
--- a/vxquery-xtest/src/test/java/org/apache/vxquery/xtest/VXQueryTest.java
+++ b/vxquery-xtest/src/test/java/org/apache/vxquery/xtest/VXQueryTest.java
@@ -65,9 +65,11 @@
             FileUtils.deleteDirectory(tmp);
         }
         new File(TMP.concat("/indexFolder")).mkdirs();
+        String HDFSFolder = TMP.concat("/hdfsFolder");
+        new File(HDFSFolder).mkdirs();
         dfs = new MiniDFS();
         try {
-            dfs.startHDFS();
+            dfs.startHDFS(HDFSFolder);
         } catch (IOException e) {
             System.err.println(e);
         }