tests: add regression test for pixar license detection (fixes #3241)

Signed-off-by: kumarasantosh <santosh.pulikond02@gmail.com>

Author: kumarasantosh

tests/licensedcode/data/datadriven/external/pixar-modified-apache.txt

@@ -0,0 +1,24 @@
+Modified Apache 2.0 License
+
+Copyright 2013 Pixar
+
+Licensed under the Apache License, Version 2.0 (the "Apache License")
+with the following modification; you may not use this file except in
+compliance with the Apache License and the following modification to it:
+
+Section 6. Trademarks. is deleted and replaced with:
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor
+   and its affiliates, except as required to comply with Section 4(c) of
+   the License and to reproduce the content of the NOTICE file.
+
+You may obtain a copy of the Apache License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the Apache License with the above modification is
+distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the Apache License for the specific
+language governing permissions and limitations under the Apache License.

tests/licensedcode/data/datadriven/external/pixar-modified-apache.txt.yml

@@ -0,0 +1,2 @@
+license_expressions:
+  - pixar