creating options to create a sanitized ami
indent issue
inverting public_ami check
use edx_internal var
moving common vars out of secrets for the public ami
moving deploy_host specific vars to edx_internal section
addressing comment
Merge pull request #1034 from edx/jarv/clean-ami

Jarv/clean ami
Preview module store.
Adding mapping for preview host.
Removing preview hash gen.
removing preview runtime config.
Deleting legacy templates.
removing unused config.
should be a dict.