Remove `delete_recursively` #693

Job	Run time
build_rsync (ubuntu-latest, 4.14.x, rsync_hardlink)	20m 20s
build_rsync (ubuntu-latest, 4.14.x, rsync_hardlink)	20m 20s
build (ubuntu-latest, 4.14.x)	23m 31s
build (ubuntu-latest, 4.14.x)	23m 31s
docker (ubuntu-latest, 4.14.x)	11m 28s
docker (ubuntu-latest, 4.14.x)	11m 28s
build (ubuntu-latest, 5)	11m 15s
build (ubuntu-latest, 5)	23m 36s
build_rsync (ubuntu-latest, 4.14.x, rsync_copy)	11m 34s
build_rsync (ubuntu-latest, 4.14.x, rsync_copy)	10m 57s
docker (ubuntu-latest, 5)	11m 27s
docker (ubuntu-latest, 5)	11m 27s
build_rsync (ubuntu-latest, 5, rsync_hardlink)	21m 38s
build_rsync (ubuntu-latest, 5, rsync_hardlink)	21m 38s
build_rsync (ubuntu-latest, 5, rsync_copy)	11m 45s
build_rsync (ubuntu-latest, 5, rsync_copy)	11m 25s
	4h 17m 20s

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