AMBARI-8805. Exception on collector start. Rat check fix.

ambari-metrics/ambari-metrics-timelineservice/src/test/java/org/apache/hadoop/yarn/server/applicationhistoryservice/metrics/timeline/AbstractTimelineAggregatorTest.java

@@ -1,22 +1,33 @@
-package org.apache.hadoop.yarn.server.applicationhistoryservice.metrics
-  .timeline;
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.yarn.server.applicationhistoryservice.metrics.timeline;
 
-import junit.framework.Assert;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.yarn.util.Clock;
 import org.junit.Before;
 import org.junit.Test;
-
 import java.io.IOException;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.concurrent.atomic.AtomicLong;
-
 import static junit.framework.Assert.assertEquals;
-import static org.apache.hadoop.yarn.server.applicationhistoryservice.metrics
-  .timeline.TimelineMetricConfiguration.AGGREGATOR_CHECKPOINT_DELAY;
-import static org.apache.hadoop.yarn.server.applicationhistoryservice.metrics
-  .timeline.TimelineMetricConfiguration.RESULTSET_FETCH_SIZE;
+import static org.apache.hadoop.yarn.server.applicationhistoryservice.metrics.timeline.TimelineMetricConfiguration.AGGREGATOR_CHECKPOINT_DELAY;
+import static org.apache.hadoop.yarn.server.applicationhistoryservice.metrics.timeline.TimelineMetricConfiguration.RESULTSET_FETCH_SIZE;
 
 public class AbstractTimelineAggregatorTest {