open-uri: accept :open_timeout option
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47869 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
open-uri: accept :open_timeout option
[Feature #10361]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47869 b2dd03c8-39d4-4d8f-98ff-823fe69b080e