VOL-4836: VOLTHA release prep.

Makefile
--------
  o Update copyright notice.
  o include a few library makefiles for displaying help, etc.
  o Added target sterile to make clean + remove venv.
  o Replace inlined rm -fr, rm -f with make builtin $(RM) && $(RM) -r

tox.ini
-------
  o Add more interpreter versions to envlist so python 3.10.x can be used.

Change-Id: Ideb7e30ff703dff18b707226a4821455f5b1f261
diff --git a/makefiles/lint/include.mk b/makefiles/lint/include.mk
index b8a1b88..979a6fb 100644
--- a/makefiles/lint/include.mk
+++ b/makefiles/lint/include.mk
@@ -1,6 +1,6 @@
 # -*- makefile -*-
 # -----------------------------------------------------------------------
-# Copyright 2017-2023 Open Networking Foundation
+# 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.
@@ -18,18 +18,11 @@
 help::
 	@echo
 	@echo "[LINT]"
-	@echo "  lint                       Static code analysis/syntax checking"
-	@echo "    LOCAL_LINT=1             Enable local linting w/o docker & jenkins overhead"
 
-ifdef LOCAL_LINT
-  # include $(MAKEDIR)/lint/json.mk              # venv dependency
-  include $(MAKEDIR)/lint/golang/sca.mk
-  include $(MAKEDIR)/lint/license/include.mk     # exclusions needed
-  # include $(MAKEDIR)/lint/python.mk
-  # include $(MAKEDIR)/lint/robot.mk             # venv dependency
-  # include $(MAKEDIR)/lint/yaml.mk              # venv needed -- alt: yamllint
-endif
-
-include $(MAKEDIR)/lint/shell.mk             # cleanup needed
+include $(MAKEDIR)/lint/json.mk
+include $(MAKEDIR)/lint/python.mk
+include $(MAKEDIR)/lint/robot.mk
+include $(MAKEDIR)/lint/shell.mk
+include $(MAKEDIR)/lint/yaml.mk
 
 # [EOF]
diff --git a/makefiles/lint/json.mk b/makefiles/lint/json.mk
index cc9ecfa..0a11c71 100644
--- a/makefiles/lint/json.mk
+++ b/makefiles/lint/json.mk
@@ -15,7 +15,7 @@
 # limitations under the License.
 # -----------------------------------------------------------------------
 
-JSON_FILES ?= $(error JSON_FILES= is required)
+JSON_FILES ?= $(error JSON_FILES= is rqeuired)
 
 .PHONY: lint-json
 
diff --git a/makefiles/lint/license/include.mk b/makefiles/lint/license/include.mk
index aaf6e47..538a415 100644
--- a/makefiles/lint/license/include.mk
+++ b/makefiles/lint/license/include.mk
@@ -1,6 +1,6 @@
 # -*- makefile -*-
 # -----------------------------------------------------------------------
-# Copyright 2022 Open Networking Foundation
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/makefiles/lint/license/license-check.sh b/makefiles/lint/license/license-check.sh
index 10d3376..bbf560e 100755
--- a/makefiles/lint/license/license-check.sh
+++ b/makefiles/lint/license/license-check.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 # -----------------------------------------------------------------------
-# Copyright 2022 Open Networking Foundation
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/makefiles/lint/license/license-helper.sh b/makefiles/lint/license/license-helper.sh
index 499f854..0f690e4 100755
--- a/makefiles/lint/license/license-helper.sh
+++ b/makefiles/lint/license/license-helper.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 # -----------------------------------------------------------------------
-# Copyright 2022 Open Networking Foundation
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/makefiles/lint/python.mk b/makefiles/lint/python.mk
index 86503a7..5aecd58 100644
--- a/makefiles/lint/python.mk
+++ b/makefiles/lint/python.mk
@@ -21,11 +21,12 @@
 
 lint : lint-python
 
+# check deps for format and python3 cleanliness
 lint-python: vst_venv
-	-source ./$</bin/activate \
-	    && set -u \
-	    && pylint $(PYTHON_FILES) \
-	    && flake8 --max-line-length=99 --count $(PYTHON_FILES)
+	source ./$</bin/activate \
+	    ; set -u \
+	    ; pylint --py3k $(PYTHON_FILES) \
+	    ; flake8 --max-line-length=99 --count $(PYTHON_FILES)
 
 help::
 	@echo "  lint-python          Syntax check using pylint and flake8"
diff --git a/makefiles/lint/robot.mk b/makefiles/lint/robot.mk
index 9808602..ec5579e 100644
--- a/makefiles/lint/robot.mk
+++ b/makefiles/lint/robot.mk
@@ -32,8 +32,8 @@
 
 lint-robot: vst_venv
 	source ./$</bin/activate \
-	    && set -u \
-	    && rflint $(LINT_ARGS) $(ROBOT_FILES)
+	    ; set -u \
+	    ; rflint $(LINT_ARGS) $(ROBOT_FILES)
 
 help::
 	@echo "  lint-robot           Syntax check robot sources using rflint"
diff --git a/makefiles/lint/shell.mk b/makefiles/lint/shell.mk
index 9f8cd58..da92921 100644
--- a/makefiles/lint/shell.mk
+++ b/makefiles/lint/shell.mk
@@ -23,7 +23,7 @@
 
 lint-shell:
 	shellcheck --version
-	find . \( -name 'staging' -o -name 'vst_venv' -o -name 'vendor' \) -prune \
+	find . \( -name 'staging' -o -name 'vst_venv' \) -prune \
 	    -o -name '*.sh' ! -name 'activate.sh' -print0 \
 	| xargs -0 -n1 shellcheck