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/make/warn-undef-vars.mk b/makefiles/lint/make/warn-undef-vars.mk
index 048d56d..36e25f9 100644
--- a/makefiles/lint/make/warn-undef-vars.mk
+++ b/makefiles/lint/make/warn-undef-vars.mk
@@ -26,7 +26,9 @@
 ##   o Definitions only exist for lint target use.
 ##   o Decrease warning volume until undef sources can be cleaned up.
 ## -----------------------------------------------------------------------
-$(if $(findstring --warn-undefined-variables,$(MAKEFLAGS)),\
+$(if $(findstring $(MAKEFLAGS),--warn-undefined-variables),\
+	$(eval IS-WARN-UNDEFINED-VARIABLES := true))
+$(if $(findstring $(MAKECMDGOALS),int lint-make),\
 	$(eval IS-WARN-UNDEFINED-VARIABLES := true))
 
 ifdef IS-WARN-UNDEFINED-VARIABLES
@@ -64,6 +66,13 @@
   $(call define-if-undef,DOC8_SOURCE)
   $(call define-if-undef,have-python-files)
 
+  $(call define-if-undef,DEBUG-onf-mk-paths)
+  $(call define-if-undef,LINT_DOC8_DEBUG)
+
+  $(call define-if-undef,lint-shell-all)
+  $(call define-if-undef,lint-shell-mod)
+  $(call define-if-undef,lint-shell-src)
+
 endif # IS-WARN-UNDEFINED-VARIABLES
 
 $(if $(DEBUG),$(warning LEAVE))