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/include.mk b/makefiles/include.mk
index 919ddaf..3cdbf2c 100644
--- a/makefiles/include.mk
+++ b/makefiles/include.mk
@@ -32,12 +32,17 @@
 ##--------------------##
 ##---]  INCLUDES  [---##
 ##--------------------##
-include $(MAKEDIR)/consts.mk
 include $(MAKEDIR)/help/include.mk
+
+include $(MAKEDIR)/consts.mk
+include $(MAKEDIR)/virtualenv.mk
+
 include $(MAKEDIR)/help/variables.mk
-include $(MAKEDIR)/lint/include.mk
 include $(MAKEDIR)/todo.mk
 
+include $(MAKEDIR)/docker/include.mk
+include $(MAKEDIR)/lint/include.mk
+
 $(if $(DEBUG),$(warning LEAVE))
 
 # [EOF]