Remove `vagrant down` test files

test/vagrant/commands/down_test.rb

@@ -1,17 +0,0 @@
-require File.join(File.dirname(__FILE__), '..', '..', 'test_helper')
-
-class CommandsDownTest < Test::Unit::TestCase
-  setup do
-    @klass = Vagrant::Commands::Down
-
-    @env = mock_environment
-    @instance = @klass.new(@env)
-  end
-
-  context "executing" do
-    should "just error and exit" do
-      @instance.expects(:error_and_exit).with(:command_deprecation_down)
-      @instance.execute
-    end
-  end
-end