Deployment ansible playbook environment separation

Hi team,

We just noticed that with the current directory structure on apr-ansible-playbooks, it's easy to mistakenly run production release command while we meant to run staging release. That is because the yml is in the same directory for each service.

With this PR, we changed the current directory structure:

deployment/
  serviceA/
    production.yml
    staging.yml
  serviceB/
    production.yml
    staging.yml
  .../

Into:

deployment/
  production/
    serviceA/production.yml
    serviceB/production.yml
    ...
  staging/
    serviceA/staging.yml
    serviceB/staging.yml
    ...

Alongside this, we also tell engineers to run commands inside  staging or production directory. That way, even if we mistakenly run production deployment on staging directory, the command will not work because the production.yml does not exist in that directory.

Note that after cd-ing to the production or staging directory, the command to deploy does not change from the previous one, i.e. we can reuse our command history.

To use this new convention, please pull the repo to the latest master.

We have updated ASG Deployment Guide to reflect this change.

Please let me (@bobbypriambodo) know if you encounter problems or if you have questions.