Add license to unit test file

Author: Dingane Hlaluku

server/src/test/java/org/apache/cloudstack/diagnostics/DiagnosticsFilesListFactoryTest.java

@@ -1,9 +1,23 @@
+// 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.cloudstack.diagnostics;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
 
 import com.cloud.vm.VMInstanceVO;
 import com.cloud.vm.VirtualMachine;
@@ -17,7 +31,7 @@
 import org.mockito.Mockito;
 import org.mockito.runners.MockitoJUnitRunner;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
 
 @RunWith(MockitoJUnitRunner.class)
 public class DiagnosticsFilesListFactoryTest {