[R-package] add reset parameters for CV object
[R-package] add reset parameters for CV object

henry0312/LightGBM,wxchan/LightGBM,henry0312/LightGBM,wxchan/LightGBM,microsoft/LightGBM,Laurae2/LightGBM,olofer/LightGBM,henry0312/LightGBM,cbecker/LightGBM,cbecker/LightGBM,Laurae2/LightGBM,Allardvm/LightGBM,Laurae2/LightGBM,olofer/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/lightgbm-gpu,Allardvm/LightGBM,huanzhang12/LightGBM,microsoft/LightGBM,huanzhang12/LightGBM,henry0312/LightGBM,Allardvm/LightGBM,sightmachine/LightGBM,fstonezst/LightGBM,cbecker/LightGBM,huanzhang12/LightGBM,fstonezst/LightGBM,microsoft/LightGBM,Allardvm/LightGBM,olofer/LightGBM,Allardvm/LightGBM,henry0312/LightGBM,sightmachine/LightGBM,wxchan/LightGBM,fstonezst/LightGBM,Laurae2/LightGBM,huanzhang12/lightgbm-gpu,huanzhang12/LightGBM,olofer/LightGBM,microsoft/LightGBM,Laurae2/LightGBM,wxchan/LightGBM,huanzhang12/LightGBM,cbecker/LightGBM,huanzhang12/lightgbm-gpu,olofer/LightGBM,fstonezst/LightGBM,sightmachine/LightGBM,fstonezst/LightGBM,wxchan/LightGBM,microsoft/LightGBM,huanzhang12/lightgbm-gpu,sightmachine/LightGBM