Refactor NOT to make directory templates

[syyang-in-cloud]

What's the issue?

• Currently, it's necessary to template the whole directory to build a custom image. There should be better way to templating only the difference.
• user-data.sh or/and
• ansible

Definition of Done

• Refactor the repo.
• update README.md

[syyang-in-cloud]

Initial thought:

1. Make base as template
2. create sub directory per TYPE, each sub directory has user-data.sh and playbook.yml
3. pass the TYPE as a variable to the script and playbook path

[syyang-in-cloud]

Quang's comment:

Why not have different user-data.sh files based on type .sh then pass TYPE variable into
packer.json:

"scripts": [
     "shell/{{TYPE}}.sh"
]

You can even use variables.json to store customizable variables.

[syyang-in-cloud]

Quang's suggestion seems reasonable ... we will take the path.