VOL-4925 - Build and release components.

go.mod
go.sum
------
  o Bump voltha-protos version string to 5.3.8.

makefiles/include.mk
makefiles/lint/include.mk
makefiles/lint/makefile.mk
makefiles/lint/shell.mk
makefiles/lint/yaml/yamllint.mk
-------------------------------
  o Added support for make library lint targets.
  o Move help target text from Makefile into makefiles/help.mk.

Change-Id: I6e54f47cb38c8946330bb3d40d2354a54a7c9a0c
diff --git a/makefiles/lint/yaml/yamllint.mk b/makefiles/lint/yaml/yamllint.mk
new file mode 100644
index 0000000..9556a45
--- /dev/null
+++ b/makefiles/lint/yaml/yamllint.mk
@@ -0,0 +1,53 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022 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.
+# 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: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+yamllint      := $(env-clean) yamllint
+
+## -------------------------------
+## Add requirement(s) for checking
+## -------------------------------
+# yamllint-cfg := .yamllint
+yamllint-cfg := yamllint.helm
+yamllint-conf = $(wildcard $(yamllint-cfg) $(MAKEDIR)/lint/yaml/$(yamllint-cfg))
+yamllint-args += $(addprefix --config-file$(space),$(yamllint-conf))
+
+# yamllint-args := --no-warnings
+# yamllint-args := --strict
+
+yamllint-find := find . -name 'vendor' -prune
+yamllint-find += -o -name '*.yaml' -type f
+yamllint-find += -print0
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+lint lint-yaml:
+	$(HIDE)$(env-clean) $(yamllint-find) \
+	    | xargs -0 --no-run-if-empty -t -n1 $(yamllint) $(yamllint-args)
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+help::
+	@echo "  lint-yaml                     Syntax check yaml sources"
+
+$(if $(DEBUG),$(warning ENTER))
+
+# [EOF]