* lib/webrick/cgi.rb (CGI::Socket): add check for existence of
  OpenSSL module in all HTTPS related methods.

* lib/webrick/cgi.rb (CGI::Socket#cipher): should create similar
  value to OpenSSL::SSLSocket#cipher.

* lib/webrick/httpresponse.rb (HTTPResponse#setup_header): should
  set "connection: close" if @keep_alive is false.

* lib/webrick/https.rb (HTTPrequest#meta_vars): add supprt for
  SSL_PROTOCOL, SSL_CIPHER_USEKEYSIZE and SSL_CIPHER_ALGKEYSIZE.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5254 b2dd03c8-39d4-4d8f-98ff-823fe69b080e