:InputBufferSize and :OutputBufferSize.
* lib/webrick/utils.rb (WEBrick::Utils.timeout): add new timeout
method. this implementation is expected to be compatible with
timeout.rb and faster than timeout.rb.
* lib/webrick/httprequest.rb (WEBrick::HTTPRequest#_read_data):
Timeout.timeout is replaced by WEBrick::Utils.timeout.
* lib/webrick/httprequest.rb: WEBrick::HTTPRequest::BUFSIZE is
replaced by config[:InputBufferSize].
* lib/webrick/httpresposne.rb: WEBrick::HTTPResponse::BUFSIZE is
replaced by config[:OutputBufferSize].
* lib/webrick/server.rb: get rid of unnecessary require.
* test/webrick/test_utils.rb: test for WEBrick::Utils.timeout.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10167 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
