VOL-4836 - Cosmetic edits to trigger a jenkins job.

Makefile
makefiles/
----------
  o Added targets help, lint, sterile, todo, {go,java,python}-all.
  o replace "rm -rf" with make builtin $(RM) -r.
  o make clean: pass --no-run-if-empty to avoid a failure condition.

tox.ini
-------
  o Test target runs cleanly with python v3.10.6 so include as a valid interpreter version.

python/
python/test/
------------
  o Cosmetic edit, update copyright notice to trigger a jenkins job.

Change-Id: I3f10ada2774b0c5c742ee4aabcd60bbb56ab76dc
diff --git a/makefiles/lint/json.mk b/makefiles/lint/json.mk
new file mode 100644
index 0000000..cc9ecfa
--- /dev/null
+++ b/makefiles/lint/json.mk
@@ -0,0 +1,35 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2022 Open Networking Foundation
+#
+# 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.
+# -----------------------------------------------------------------------
+
+JSON_FILES ?= $(error JSON_FILES= is required)
+
+.PHONY: lint-json
+
+lint : lint-json
+
+lint-json: vst_venv
+	source ./$</bin/activate \
+	    ; set -u \
+	    ; for jsonfile in $(JSON_FILES); do \
+		echo "Validating json file: $$jsonfile" ;\
+		python -m json.tool $$jsonfile > /dev/null ;\
+	done
+
+help::
+	@echo "  lint-json            Syntax check json sources"
+
+# [EOF]