34b64ec247
Prior to this commit, if you specified a `version` for the salt provider but no `install_type` Vagrant would fail to pass the proper parameters to the bootstrap install script. This commit fixes that by adding some validation to the salt provider if `version` is specified but not `install_type`. It also adds some extra context for certain config validation error messages so that the user knows what option was incorrect, rather than the message just referring to the option as *this*.
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.