[tachyon] Minor fix in codestyle and warnings

flink-addons/flink-tachyon/src/test/java/org/apache/flink/tachyon/HDFSTest.java

@@ -15,11 +15,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.flink.tachyon;
 
+package org.apache.flink.tachyon;
 
 import org.apache.commons.io.IOUtils;
-import org.apache.flink.core.fs.FSDataInputStream;
 import org.apache.flink.core.fs.FileSystem;
 import org.apache.flink.core.fs.Path;
 import org.apache.flink.examples.java.wordcount.WordCount;

flink-addons/flink-tachyon/src/test/java/org/apache/flink/tachyon/TachyonFileSystemWrapperTest.java

@@ -25,7 +25,6 @@ import org.apache.flink.configuration.ConfigConstants;
 import org.apache.flink.configuration.GlobalConfiguration;
 import org.apache.flink.examples.java.wordcount.WordCount;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.junit.After;
 import org.junit.Assert;
@@ -114,7 +113,7 @@ public class TachyonFileSystemWrapperTest {
 			Configuration conf = new Configuration();
 			conf.addResource(HADOOP_CONFIG_PATH);
 			Assert.assertEquals("tachyon.hadoop.TFS", conf.get("fs.tachyon.impl", null));
-			FileSystem hfs = tPath.getFileSystem(conf);
+			tPath.getFileSystem(conf);
 		} catch(Exception e) {
 			e.printStackTrace();
 			Assert.fail("Test failed with exception: "+e.getMessage());