merge revision(s) 56399:
* tool/downloader.rb: Removed verification of gem certification. Because signed gem is not working on rubygems ecosystem. * tool/gem-unpack.rb: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@56402 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 56399:
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@56402 b2dd03c8-39d4-4d8f-98ff-823fe69b080e