Adds missing license headers. (#3651)

* Adds missing license headers.

* PR feedback.

Author: codemzs

src/Microsoft.ML.FastTree/Utils/BufferPoolManager.cs

@@ -1,8 +1,6 @@
-// -----------------------------------------------------------------------
-// <copyright file="BufferPoolManager.cs" company="Microsoft Corporation">
-//     Copyright (C) All Rights Reserved
-// </copyright>
-// -----------------------------------------------------------------------
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
 using System;
 using System.Collections.Concurrent;

src/Microsoft.ML.TensorFlow/TensorFlow/TensorGeneric.cs

@@ -1,5 +1,6 @@
-// Copyright (c) Microsoft. All rights reserved.
-// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
 using System;
 using System.Text;

src/Microsoft.ML.TensorFlow/TensorFlow/TensorGeneric.tt

@@ -5,11 +5,14 @@
 <#@ import namespace="System.Text" #>
 <#@ import namespace="System.Collections.Generic" #>
 <#@ import namespace="System.Runtime.InteropServices" #>
-<#@ output extension=".cs" #>// Copyright (c) Microsoft. All rights reserved.
-// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+<#@ output extension=".cs" #>
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
 
 using System;
 using System.Text;
+using Microsoft.ML.Runtime;
 
 namespace Microsoft.ML.Transforms.TensorFlow
 {