Boolean types (and possibly a few others) are returned as wrapper
classes when coming out from proto mapping; these need to be unwrapped
otherwise the caller who is expecting a nice clean boolean value ends up
with an icky protobuf class.
This fixes the shell provisioner, which relies on a communicator
receiving a settings hash `{error_check: false}` for a command that
usually fails but it sent just in case before provisioning starts.
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.
Generate proto
grpc_tools_ruby_protoc -I . --ruby_out=gen/plugin --grpc_out=gen/plugin ./plugin_server.proto