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/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..98f43ad
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,5 @@
+grpcio==1.39.0
+protobuf==3.17.3
+grpcio-tools==1.39.0
+googleapis-common-protos==1.52.0
+nose2[coverage_plugin]