(v11) Fix Unexpected error undefined method `path=` for Fluentd::Logger

bin/fluentd -o log.txt

    Unexpected error undefined method `path=' for #<Fluentd::Logger:0x002aeb54010e40>
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/config_loader.rb:54:in `reload_config'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/multi_worker_server.rb:80:in `reload_config'
      /home/seo.naotoshi/gitrepos/fluentd_v11/lib/fluentd/server.rb:73:in `reload_config'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/supervisor.rb:61:in `initialize'
      /home/seo.naotoshi/gitrepos/fluentd_v11/lib/fluentd/server.rb:68:in `initialize'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/supervisor.rb:83:in `block (2 levels) in create_server_proc'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/supervisor.rb:83:in `instance_eval'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/supervisor.rb:83:in `block in create_server_proc'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/daemon.rb:160:in `call'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/daemon.rb:160:in `create_server'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/daemon.rb:99:in `main'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/gems/2.0.0/gems/serverengine-1.5.3/lib/serverengine/daemon.rb:90:in `run'
      /home/seo.naotoshi/gitrepos/fluentd_v11/lib/fluentd/server.rb:64:in `run'
      /home/seo.naotoshi/gitrepos/fluentd_v11/lib/fluentd/command/fluentd.rb:166:in `<top (required)>'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
      /home/seo.naotoshi/.rbenv/versions/2.0.0-p195/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'

serverengine require `path=` method for a logger. As you know, it seems that the internal logger `ServerEngine::DaemonLogger` has it. https://github.com/frsyuki/serverengine/blob/master/lib/serverengine/daemon_logger.rb#L45