Emitting the packer templates used to build each machine type

[arizvisa]

When choosing to build a template with this project, the packer template that's generated should be consolidated from all of its parts and written into the output directory. Despite already having a template for a particular virtualization platform, emitting the packer template in JSON would then allow someone to rebuild the template exactly.

[arizvisa]

Consolidation of all of the master template's components will likely also need to include the default states and pillar that are deployed for supporting the "master-bootstrap", "master", and "bootstrap" environments as documented in issue #7.