VOL-4977 - Failure in voltha-protos verification job.

Makefile
makefiles/consts.mk
makefiles/include.mk
virtualenv.mk
requirements.txt
--------------------
  o Added library makefiles from repo:onf-make to handle virtualenv setup/removal.
  o go-clean - augment clean rule, current behavior leaves directory unbuildable.

makefiles/docker/include.mk
---------------------------
  o Replace inlined copies of docker cli arguments with macros: is-stdin, docker-run, etc.
  o Moved docker command wrappers: PROTOC, etc into docker/include.mk

makefiles/help/*.mk
-------------------
  o Update and align makefile target help text.

Change-Id: Ifcf72e8081efc6e0d828ee4b1b96c66a219a39b9
diff --git a/makefiles/help/include.mk b/makefiles/help/include.mk
index 7a93bd0..ffd390f 100644
--- a/makefiles/help/include.mk
+++ b/makefiles/help/include.mk
@@ -18,29 +18,28 @@
 # Parent makefile should include this early so help
 # message will be prefixed by a usage statement.
 help ::
-	@echo "Usage: $(MAKE) [options] [target] ..."
 	@echo
-	@echo '[Virtual Env]'
-	@echo '  venv           Create a python virtual environment'
-	@echo '  venv_protos    Create a python virtual environment'
-	@echo "  $(VENV_NAME)"
+	@echo "Usage: $(MAKE) [options] [target] ..."
+
 	@echo
 	@echo '[ACTION] - golang, java and python'
 	@echo '  protos'
 	@echo '  build'
 	@echo '  test'
-	@echo
-	@echo '[CLEAN]'
-	@echo '  clean          Remove generated targets'
-	@echo '  sterile        clean + remove virtual env interpreter install'
+
 	@echo
 	@echo '[HELP]'
-	@echo '  help           Display program help'
+	@echo '  help                         Display program help'
 #	@echo '  help-verbose   Display additional targets and help'
+
 	@echo
 	@echo '[PROTOS: generate]'
 	@echo '  go-protos'
 	@echo '  java-protos'
 	@echo '  python-protos'
 
+	@echo
+	@echo '[MISC]'
+	@echo '  repair                       Recover from a common fatal build condition'
+
 # [EOF]