drive: tweak pacer to speed up directory listings and make more reliable
drive: tweak pacer to speed up directory listings and make more reliable

olihey/rclone,B4dM4n/rclone,arcimboldo/rclone,jackschmidt/rclone,B4dM4n/rclone,kynikos/rclone,olihey/rclone,ncw/rclone,seuffert/rclone,ncw/rclone,kynikos/rclone,arcimboldo/rclone,B4dM4n/rclone,kynikos/rclone,olihey/rclone,arcimboldo/rclone,yonjah/rclone,yonjah/rclone,yonjah/rclone,jackschmidt/rclone,jackschmidt/rclone,B4dM4n/rclone,seuffert/rclone,ncw/rclone,arcimboldo/rclone,seuffert/rclone,yonjah/rclone,jackschmidt/rclone,kynikos/rclone,ncw/rclone,seuffert/rclone,olihey/rclone