[ruby-cvs:71861] hsbt:r64769 (trunk): Merge upstream revision of rubygems/rubygems.

[hsbt at ruby-lang.org]

hsbt	2018-09-18 17:37:18 +0900 (Tue, 18 Sep 2018)

  New Revision: 64769

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64769

  Log:
    Merge upstream revision of rubygems/rubygems.
    
      This commits includes tiny bugfix and new features listed here:
        * Add --re-sign flag to cert command by bronzdoc: https://github.com/rubygems/rubygems/pull/2391
        * Download gems with threads. by indirect: https://github.com/rubygems/rubygems/pull/1898

  Modified files:
    trunk/lib/rubygems/commands/cert_command.rb
    trunk/lib/rubygems/config_file.rb
    trunk/lib/rubygems/installer.rb
    trunk/lib/rubygems/request_set.rb
    trunk/lib/rubygems/resolver/specification.rb
    trunk/lib/rubygems/security/signer.rb
    trunk/lib/rubygems/user_interaction.rb
    trunk/test/rubygems/test_gem_commands_cert_command.rb
    trunk/test/rubygems/test_gem_stream_ui.rb