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/packer/provision/install-base-pkgs-Ubuntu.yaml b/packer/provision/install-base-pkgs-Ubuntu.yaml
index 2ab6308..bd603d8 100644
--- a/packer/provision/install-base-pkgs-Ubuntu.yaml
+++ b/packer/provision/install-base-pkgs-Ubuntu.yaml
@@ -12,4 +12,4 @@
       - equivs
       - gdebi
     state: latest
-  become: yes
+  become: true