[EXPERIMENTAL] Support upload option for s3 package hosting.
Example: $ ruby tool/make-snapshot -archname=snapshot -s3=tmp /tmp trunk
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62596 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
[EXPERIMENTAL] Support upload option for s3 package hosting.
Example:
$ ruby tool/make-snapshot -archname=snapshot -s3=tmp /tmp trunk
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62596 b2dd03c8-39d4-4d8f-98ff-823fe69b080e