Sorting functions for common use #870

Job	Run time
build (3Mi, change-to-primary)	3m 34s
build (3Mi, full-backup)	2m 39s
build (3Mi, backup-failure)	2m 41s
build (3Mi, incr-backup)	2m 43s
build (3Mi, change-to-secondary)	2m 39s
build (10Mi, various-transfer-part-size)	2m 39s
build (3Mi, change-to-standalone)	2m 37s
build (200Gi, various-transfer-part-size)	2m 41s
build (3Mi, !//)	2m 42s
	24m 55s

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