Get rid of the UNSET_VALUE stuff, save it for v2

lib/vagrant/config/v1/base.rb

@@ -5,11 +5,6 @@ module Vagrant
       # from this class but this class provides useful helpers that config
       # classes may wish to use.
       class Base
-        # This is a useful default to use for attributes, and the built-in
-        # merge for this class will use this as a marker that a value is
-        # unset (versus just being explicitly set to `nil`)
-        UNSET_VALUE = Object.new
-
         # Merge another configuration object into this one. This assumes that
         # the other object is the same class as this one.
         #

plugins/kernel/config/nfs.rb

@@ -5,11 +5,6 @@ module VagrantPlugins
     class NFSConfig < Vagrant::Config::V1::Base
       attr_accessor :map_uid
       attr_accessor :map_gid
-
-      def initialize
-        @map_uid = UNSET_VALUE
-        @map_gid = UNSET_VALUE
-      end
     end
   end
 end

plugins/kernel/config/package.rb

@@ -4,10 +4,6 @@ module VagrantPlugins
   module Kernel
     class PackageConfig < Vagrant::Config::V1::Base
       attr_accessor :name
-
-      def initialize
-        @name = UNSET_VALUE
-      end
     end
   end
 end

plugins/kernel/config/ssh.rb

@@ -15,29 +15,13 @@ module VagrantPlugins
       attr_accessor :forward_x11
       attr_accessor :shell
 
-      def initialize
-        @username         = UNSET_VALUE
-        @password         = UNSET_VALUE
-        @host             = UNSET_VALUE
-        @port             = UNSET_VALUE
-        @guest_port       = UNSET_VALUE
-        @max_tries        = UNSET_VALUE
-        @timeout          = UNSET_VALUE
-        @private_key_path = UNSET_VALUE
-        @forward_agent    = UNSET_VALUE
-        @forward_x11      = UNSET_VALUE
-        @shell            = UNSET_VALUE
-      end
-
       def validate(env, errors)
         [:username, :host, :max_tries, :timeout].each do |field|
           value = instance_variable_get("@#{field}".to_sym)
-          if value == UNSET_VALUE || !value
-            errors.add(I18n.t("vagrant.config.common.error_empty", :field => field))
-          end
+          errors.add(I18n.t("vagrant.config.common.error_empty", :field => field)) if !value
         end
 
-        if private_key_path && private_key_path != UNSET_VALUE && !File.file?(File.expand_path(private_key_path, env.root_path))
+        if private_key_path && !File.file?(File.expand_path(private_key_path, env.root_path))
           errors.add(I18n.t("vagrant.config.ssh.private_key_missing", :path => private_key_path))
         end
       end

plugins/kernel/config/vagrant.rb

@@ -5,11 +5,6 @@ module VagrantPlugins
     class VagrantConfig < Vagrant::Config::V1::Base
       attr_accessor :dotfile_name
       attr_accessor :host
-
-      def initialize
-        @dotfile_name = UNSET_VALUE
-        @host         = UNSET_VALUE
-      end
     end
   end
 end