Ruby

webrick: add Server Name Indication (SNI)

• lib/webrick/https.rb: servername_cb implementation.
• lib/webrick/ssl.rb: abstract servername_cb.
• test/webrick/test_https.rb: test.
  [ruby-dev:50165] [Feature #13729]
  Author: Tietew [email protected]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59281 b2dd03c8-39d4-4d8f-98ff-823fe69b080e