68dda8f853
Prior to this commit, if you went to validate your Vagrantfile and wanted to ignore the provider, Vagrant would still fail as it checks if there are any registered providers that are installed and usable. This commit mocks out all registered providers to bypass that for the validate command so that Vagrant can just validate the config and ignore any provider config blocks.
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.