copyright: move to SPDX-License-Identifier

Using SPDX-License-Identifier is more compact and leaves more space on
the screen.

Following the example of bmcweb here and replacing all the old copyright
headers with SPDX.

Change-Id: Iace8c887d58e554e0521b040d332c624a20a3aa8
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/src/utils.cpp b/src/utils.cpp
index 0d3a6d0..f0e8d25 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -1,19 +1,5 @@
-/*
-// Copyright (c) 2017 Intel Corporation
-//
-// Licensed 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.
-*/
-/// \file utils.cpp
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright 2017 Intel Corporation
 
 #include "utils.hpp"