Update repository to use repo:onf-make/makefiles

.gitmodules
Makefile
config.mk -> lf/config.mk
lf/include.mk
lf/local/include.mk
lf/onf-make
makefiles/README.md
-------------------------
  o Initial staging to remove per-repository makefiles/ directory.
  o Add repo:onf-make as a git submodule.
  o lf/include.mk is central access for loading all library logic.
  o lf/local/ replaces $(sandbox-root)/makefiles.

*.groovy, *.sh, *.yaml
----------------------
  o Include source edits to force pipeline to rebuild.
  o Added SPDX copyright notice tokens.

Change-Id: Ia6b95880e720956d01af2c5966f7ae5d0f4c13b1
diff --git a/lf/include.mk b/lf/include.mk
new file mode 100644
index 0000000..7034ea3
--- /dev/null
+++ b/lf/include.mk
@@ -0,0 +1,84 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2023-2024 Open Networking Foundation Contributors
+#
+# 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.
+# -----------------------------------------------------------------------
+# SPDX-FileCopyrightText: 2023-2024 Open Networking Foundation Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+## -----------------------------------------------------------------------
+## Infer path to cloned sandbox root
+## [TODO] Deprecate TOP=
+## -----------------------------------------------------------------------
+lf-sbx-root   := $(abspath $(lastword $(MAKEFILE_LIST)))
+lf-sbx-root   := $(subst /lf/include.mk,$(null),$(lf-sbx-root))
+
+## -----------------------------------------------------------------------
+## Define vars based on relative import (normalize symlinks)
+## Usage: include makefiles/onf/include.mk
+## -----------------------------------------------------------------------
+onf-mk-abs    := $(abspath $(lastword $(MAKEFILE_LIST)))
+onf-mk-top    := $(subst /include.mk,$(null),$(onf-mk-abs))
+onf-mk-lib    := $(onf-mk-top)/onf-make/makefiles
+onf-mk-loc    := $(onf-mk-top)/local
+
+TOP           ?= $(patsubst %/makefiles/include.mk,%,$(onf-mk-abs))
+
+## ------------------------------------------------------
+## Two distinct vars needed to access library or project
+## ------------------------------------------------------
+ONF_MAKEDIR ?= $(onf-mk-lib)
+MAKEDIR     ?= $(onf-mk-loc)
+
+# Load per-repository conditionals
+# Load late else alter MAKEFILE_LIST
+include $(lf-sbx-root)/lf/config.mk
+
+## -----------------------------------------------------------------------
+## Load makefiles in order:
+##   1) Library constants and logic loaded first
+##   2) Parameterize and augment targets from local (repo specific)
+## -----------------------------------------------------------------------
+include $(onf-mk-lib)/include.mk
+include $(onf-mk-loc)/include.mk
+
+## -----------------------------------------------------------------------
+## Intent: This target will update dependent git-submodule to the latest
+##         version available from the remote repository.  Subsequently
+##         a checkin will be needed to make the submodule update permanent.
+## -----------------------------------------------------------------------
+update-submodules:
+	git submodule foreach git pull
+
+## -----------------------------------------------------------------------
+## Intent: On-demand cloning of git submodule(s).
+## -----------------------------------------------------------------------
+## Trigger: include $(onf-mk-lib)/include.mk
+##   - When the make command attempts to include a makefile from the
+##     repo:onf-make submodule, this target/dependency will initialize
+##     and checkout all submodules the current repository depends on.
+## -----------------------------------------------------------------------
+$(onf-mk-lib)/include.mk:
+	@echo
+	@echo "** Checkout git submodule(s)"
+	@echo "** -----------------------------------------------------------------------"
+	git submodule update --init --recursive
+	@echo "** -----------------------------------------------------------------------"
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]