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/etc/include.mk b/makefiles/etc/include.mk
index cc17c2e..0713718 100644
--- a/makefiles/etc/include.mk
+++ b/makefiles/etc/include.mk
@@ -20,7 +20,7 @@
 
 $(if $(DEBUG),$(warning ENTER))
 
-include $(ONF_MAKEDIR)/etc/features.mk
+include $(onf-mk-dir)/etc/features.mk
 
 $(if $(DEBUG),$(warning LEAVE))