drive: reduce bandwidth by adding fields for partial responses
drive: reduce bandwidth by adding fields for partial responses

Fixes #1346

yonjah/rclone,yonjah/rclone,yonjah/rclone,seuffert/rclone,ncw/rclone,B4dM4n/rclone,B4dM4n/rclone,B4dM4n/rclone,olihey/rclone,seuffert/rclone,ncw/rclone,ncw/rclone,olihey/rclone,B4dM4n/rclone,seuffert/rclone,yonjah/rclone,olihey/rclone,seuffert/rclone,olihey/rclone,ncw/rclone