webrick/utils.rb: suppress messages
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54958 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
webrick/utils.rb: suppress messages
progress messages from WEBrick::Utils#create_self_signed_cert.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54958 b2dd03c8-39d4-4d8f-98ff-823fe69b080e