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Except ':children' for groups of groups, it is safer to avoid generating ':suffix' blocks. At the moment Ansible only supports (but doesn't recommend) group variables (:vars), and the Vagrant Ansible provisioner won't support this way to define variables.
Vagrant Core Plugins
These are plugins that ship with Vagrant. Vagrant core uses its own plugin system to power a lot of the core pieces that ship with Vagrant. Each plugin will have its own README which explains its specific role.