Updates for the pre-commit hook

.pre-commit-config.yaml
-----------------------
  o Add more hooks

bin/setup.sh
makefiles/commands/kail/godownloader.sh
---------------------------------------
  o Shellcheck cleanups

install/README.md
-----------------
  o Add a project copyright notice.

makefiles/.../*.mk
------------------
  o Update copyright notice.
  o Replace legacy var $(ONF_MAKEDIR) with onf-mk-dir=

makefiles/virtualenv/include.mk
-------------------------------
  o Fixed a small problem with targets clean & sterile.
  o Clean target should remove

Change-Id: If624531f4d38aaacc200d3c49aee2c3804122ffb
Signed-off-by: Joey Armstrong <jarmstrong@linuxfoundation.org>
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/include.mk b/makefiles/lint/yaml/byrepo/voltha-lib-go/include.mk
index 7f2ebfe..c930cdc 100644
--- a/makefiles/lint/yaml/byrepo/voltha-lib-go/include.mk
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/include.mk
@@ -25,7 +25,7 @@
 ##--------------------##
 ##---]  INCLUDES  [---##
 ##--------------------##
-include $(ONF_MAKEDIR)/lint/yaml/byrepo/$(--repo-name--)/yamllint.mk
+include $(onf-mk-dir)/lint/yaml/byrepo/$(--repo-name--)/yamllint.mk
 
 $(if $(DEBUG),$(warning LEAVE))
 
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.mk b/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.mk
index fb56e3a..8143bfe 100644
--- a/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.mk
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.mk
@@ -31,7 +31,7 @@
 ## Add requirement(s) for checking
 ## -------------------------------
 yamllint-cfg  := yamllint.helm
-yamllint-conf = $(wildcard $(yamllint-cfg) $(ONF_MAKEDIR)/lint/yaml/$(yamllint-cfg))
+yamllint-conf = $(wildcard $(yamllint-cfg) $(onf-mk-dir)/lint/yaml/$(yamllint-cfg))
 yamllint-args += $(addprefix --config-file$(space),$(yamllint-conf))
 yamllint-args += --strict
 
diff --git a/makefiles/lint/yaml/include.mk b/makefiles/lint/yaml/include.mk
index 7518d51..7191abe 100644
--- a/makefiles/lint/yaml/include.mk
+++ b/makefiles/lint/yaml/include.mk
@@ -27,16 +27,16 @@
 ##--------------------##
 ##---]  INCLUDES  [---##
 ##--------------------##
-include $(ONF_MAKEDIR)/lint/yaml/help.mk
-# include $(ONF_MAKEDIR)/lint/yaml/find_utils.mk
-include $(ONF_MAKEDIR)/lint/yaml/install.mk
+include $(onf-mk-dir)/lint/yaml/help.mk
+# include $(onf-mk-dir)/lint/yaml/find_utils.mk
+include $(onf-mk-dir)/lint/yaml/install.mk
 
 # [TODO] Consolidate and refactor to support a simpler answer
 # Special snowflake linting requirements
--include $(ONF_MAKEDIR)/lint/yaml/byrepo/$(--repo-name--)/include.mk
+-include $(onf-mk-dir)/lint/yaml/byrepo/$(--repo-name--)/include.mk
 
 # Standard lint-yaml targets
-include $(ONF_MAKEDIR)/lint/yaml/yamllint.mk
+include $(onf-mk-dir)/lint/yaml/yamllint.mk
 
 --onf-mk-lint-yaml-- := true#        # Flag to inhibit re-including