add tailx 模式，file reader支持pattern形式的路径
add tailx 模式，file reader支持pattern形式的路径

qiniu/logkit,qiniu/logkit,qiniu/logkit,andrewei1316/logkit,andrewei1316/logkit,wonderflow/logkit-1,andrewei1316/logkit,qiniu/logkit,andrewei1316/logkit,wonderflow/logkit-1,qiniu/logkit,wonderflow/logkit-1,wonderflow/logkit-1