Merge pull request #307 from cybozu-go/7388-multi-controller-3 #1454

Job	Run time
build (1.35.1, 3Mi, lock)	22m 24s
build (1.35.1, 3Mi, change-to-secondary)	30m 31s
build (1.35.1, 200Gi, various-transfer-part-size)	24m 32s
build (1.35.1, 3Mi, incr-backup)	32m 52s
build (1.35.1, 3Mi, !//)	32m 53s
build (1.34.4, 3Mi, full-backup)	32m 55s
build (1.35.1, 3Mi, change-to-primary)	31m 50s
build (1.35.1, 3Mi, change-to-standalone)	24m 13s
build (1.35.1, 10Mi, various-transfer-part-size)	23m 39s
build (1.35.1, 3Mi, full-backup)	32m 54s
build (1.35.1, 3Mi, backup-failure)	32m 53s
	5h 21m 36s

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