Merge pull request #277 from cybozu-go/implement-new-mbc-controller #1327

Job	Run time
build (1.35.4, 3Mi, change-to-standalone)	24m 42s
build (1.35.4, 3Mi, incr-backup)	38m 28s
build (1.35.4, 3Mi, lock)	25m 16s
build (1.35.4, 3Mi, change-to-primary)	31m 21s
build (1.35.4, 3Mi, change-to-secondary)	30m 2s
build (1.35.4, 10Mi, various-transfer-part-size)	23m 3s
build (1.35.4, 3Mi, backup-failure)	32m 28s
build (1.35.4, 3Mi, !//)	48m 26s
build (1.35.4, 200Gi, various-transfer-part-size)	23m 31s
build (1.35.4, 3Mi, full-backup)	34m 30s
build (1.34.4, 3Mi, full-backup)	37m 21s
	5h 49m 8s

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