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]