makefiles/
----------
  o Adding more lint target logic.
  o Copy in virtualenv.mk from voltha-docs to support dependency
    based virtualenv installations.

*/*.yaml
--------
  o Misc yamllint cleanups.

Makefile
--------
  o Prune inlined logic since replaced by library makefile logic.
  o Replaced explicit pyenv installation with dependency driven
    so venv will only require installation once per target run.
  o Library make clean/sterile targets handle cleanup.

Change-Id: Ie2ce0ebc01b07c0004a5904c2641c394e46d5044
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..f199722
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+jenkins-job-builder==4.1.0
+pipdeptree