This release removes uses of Kernel#open to avoid unintended
behaviors and make future auditing easier. [Misc #14216]

6 changes since 1.4.1:

      webrick: httpauth requires regular files
      webrick/httpservlet/cgi_runner.rb: remove unnecessary open
      webrick: WEBrick::Log requires path arg when given string
      webrick/httpservlet/*handler: use File.open
      webrick/httputils: note Kernel#open behavior
      webrick/httpservelet/cgi_runner: avoid IO#reopen on pathname

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61443 b2dd03c8-39d4-4d8f-98ff-823fe69b080e