code: function(oldName, newName) {
  		this._batchHost(function(hostsobject) {
  			if (hostsobject[oldName] && ! hostsobject[newName]) {
  				hostsobject[newName] = hostsobject[oldName];
  				delete hostsobject[oldName];
  				return hostsobject;
  			}
  		});
  	}
docs: 修改分组名