Fix uninitialized constants

Author: cosmo0920

lib/fluent/plugin/in_syslog.rb

@@ -181,11 +181,11 @@ def listen(callback)
       client = ServerEngine::SocketManager::Client.new(socket_manager_path)
       if @protocol_type == :udp
         @usock = client.listen_udp(@bind, @port)
-        SocketUtil::UdpHandler.new(@usock, log, 2048, callback)
+        Fluent::SocketUtil::UdpHandler.new(@usock, log, 2048, callback)
       else
         # syslog family add "\n" to each message and this seems only way to split messages in tcp stream
         lsock = client.listen_tcp(@bind, @port)
-        Coolio::TCPServer.new(lsock, nil, SocketUtil::TcpHandler, log, "\n", callback)
+        Coolio::TCPServer.new(lsock, nil, Fluent::SocketUtil::TcpHandler, log, "\n", callback)
       end
     end