* lib/rubygems/config_file.rb:  Add missing require for
  user_interaction.rb

* lib/rubygems/dependency_installer.rb:  Minor refactor for clarity.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39148 b2dd03c8-39d4-4d8f-98ff-823fe69b080e