ATLAS-1436: added license text for the file added in the earlier commit

repository/src/test/java/org/apache/atlas/services/MetricsServiceTest.java

+/**
+ * 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.atlas.services;
 
 import org.apache.atlas.model.metrics.AtlasMetrics;
@@ -103,4 +120,4 @@ public class MetricsServiceTest {
         metricsService.getMetrics(true);
         verify(mockGraph, atLeastOnce()).executeGremlinScript(anyString(), anyBoolean());
     }
-}
+}
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