Inital Commit: Default buildout for fresh VM

Install pip, docker, and a few other baseline packages. Ensure zware
user is setup and has a fresh SSH key. Some of this is duplicating
efforts of the install_dotfiles.sh, but ideal this will replace or at
least supplement that script.

defaults/main.yml

@@ -0,0 +1,6 @@
+---
+# defaults file for ./default-buildout
+pip_install_packages:
+  - name: docker
+docker_users:
+  - zware