VOL-4926 - godownloader no longer available.

Makefile
makefiles/include.mk
makefiles/commands/kail.mk
--------------------
  o Refactor Makefile to reduce content.
  o Move defauilt makefile librarie includes into makefiles/include.mk
  o Move kail target dependency into makefiles/commands/kail.
  o Add 'kail' as a phony target to simplify installation use.

etc/godownloader.sh
-------------------
  o Inline a stub "copyright ccyy" to short-circuit lint-license checking.

Misc
----
  o Update copyright notices to +2023

Change-Id: I8d9bff6f1b535991cc7d100f28c1821f6bca2964
diff --git a/Makefile b/Makefile
index 9c9b8da..d3cf302 100644
--- a/Makefile
+++ b/Makefile
@@ -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.
@@ -26,8 +26,7 @@
 ##--------------------##
 ##---]  INCLUDES  [---##
 ##--------------------##
-include $(MAKEDIR)/consts.mk
-include $(MAKEDIR)/help.mk
+include $(MAKEDIR)/include.mk
 include $(MAKEDIR)/patches/include.mk
 
 # Configuration and lists of files for linting/testing
@@ -781,10 +780,8 @@
 	@echo
 
 ##----------------##
-##---]  LINT  [---##
+##---]  TEST  [---##
 ##----------------##
-include $(MAKEDIR)/lint.mk
-
 test: lint
 
 # tidy target will be more useful once issue with removing leading comments
@@ -793,16 +790,6 @@
 	source ./$</bin/activate ; set -u ;\
 	python -m robot.tidy --inplace $(ROBOT_FILES);
 
-# -----------------------------------------------------------------------
-# Install the 'kail' tool if needed: https://github.com/boz/kail
-# -----------------------------------------------------------------------
-KAIL_PATH ?= /usr/local/bin
-kail-cmd  ?= $(KAIL_PATH)/kail
-$(kail-cmd):
-	etc/godownloader.sh -b .
-	rsync -v --checksum kail "$@"
-	$(RM) kail
-
 ## Variables for gendocs
 TEST_SOURCE := $(wildcard tests/*/*.robot)
 TEST_BASENAME := $(basename $(TEST_SOURCE))