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/targets/include.mk b/makefiles/targets/include.mk
index 20e1bf5..32c99b9 100644
--- a/makefiles/targets/include.mk
+++ b/makefiles/targets/include.mk
@@ -26,10 +26,10 @@
 ##-------------------##
 ##---]  TARGETS  [---##
 ##-------------------##
-include $(ONF_MAKEDIR)/targets/clean.mk
-include $(ONF_MAKEDIR)/targets/check.mk
-include $(ONF_MAKEDIR)/targets/sterile.mk
-include $(ONF_MAKEDIR)/targets/test/include.mk
+include $(onf-mk-dir)/targets/clean.mk
+include $(onf-mk-dir)/targets/check.mk
+include $(onf-mk-dir)/targets/sterile.mk
+include $(onf-mk-dir)/targets/test/include.mk
 
 $(if $(DEBUG),$(warning LEAVE))
 
diff --git a/makefiles/targets/test/include.mk b/makefiles/targets/test/include.mk
index a706bfd..54b9ef8 100644
--- a/makefiles/targets/test/include.mk
+++ b/makefiles/targets/test/include.mk
@@ -24,7 +24,7 @@
 $(if $(DEBUG),$(warning ENTER))
 
 # Special snowflake: repository-dependent test target
--include $(ONF_MAKEDIR)/targets/test/$(--repo-name--).mk
+-include $(onf-mk-dir)/targets/test/$(--repo-name--).mk
 
 $(if $(DEBUG),$(warning LEAVE))