Provide rgloader for project local plugins

lib/vagrant/environment.rb

@@ -906,6 +906,13 @@ module Vagrant
       begin
         @logger.debug("Creating: #{@local_data_path}")
         FileUtils.mkdir_p(@local_data_path)
+        # Create the rgloader/loader file so we can use encoded files.
+        loader_file = @local_data_path.join("rgloader", "loader.rb")
+        if !loader_file.file?
+          source_loader = Vagrant.source_root.join("templates/rgloader.rb")
+          FileUtils.mkdir_p(@local_data_path.join("rgloader"))
+          FileUtils.cp(source_loader.to_s, loader_file.to_s)
+        end
       rescue Errno::EACCES
         raise Errors::LocalDataDirectoryNotAccessible,
           local_data_path: @local_data_path.to_s