test_dns.rb: fix scope

* test/resolv/test_dns.rb (test_query_ipv4_address): fix local
  variables scope.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48983 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
console.c: IO.console arguments passing

* ext/io/console/console.c (console_dev): send the given arguments
  to the opened console.  as a special case, do nothing if :close
  is given.

* test/lib/leakchecker.rb (LeakChecker#check_fd_leak): close if
  console.