lock the rbd volume while importing process #904

Job	Run time
build (3Mi, full-backup)	22m 39s
build (3Mi, backup-failure)	29m 49s
build (3Mi, change-to-primary)	27m 27s
build (3Mi, !//)	37m 15s
build (3Mi, lock)	21m 40s
build (3Mi, change-to-secondary)	26m 16s
build (3Mi, incr-backup)	34m 40s
build (200Gi, various-transfer-part-size)	22m 6s
build (3Mi, change-to-standalone)	22m 23s
build (10Mi, various-transfer-part-size)	20m 0s
build (3Mi, backup-failure)	29m 49s
build (3Mi, change-to-standalone)	22m 23s
build (3Mi, incr-backup)	36m 17s
build (3Mi, full-backup)	27m 46s
build (3Mi, lock)	23m 8s
build (10Mi, various-transfer-part-size)	20m 0s
build (3Mi, !//)	37m 15s
build (200Gi, various-transfer-part-size)	22m 6s
build (3Mi, change-to-secondary)	26m 16s
build (3Mi, change-to-primary)	27m 27s
build (3Mi, backup-failure)	29m 49s
build (3Mi, change-to-secondary)	26m 16s
build (3Mi, change-to-primary)	27m 27s
build (3Mi, incr-backup)	40m 40s
build (3Mi, !//)	37m 15s
build (200Gi, various-transfer-part-size)	22m 6s
build (3Mi, lock)	23m 8s
build (10Mi, various-transfer-part-size)	20m 0s
build (3Mi, change-to-standalone)	22m 23s
build (3Mi, full-backup)	27m 46s
build (3Mi, backup-failure)	29m 49s
build (3Mi, incr-backup)	35m 54s
build (3Mi, full-backup)	27m 46s
build (3Mi, change-to-primary)	27m 27s
build (3Mi, change-to-standalone)	22m 23s
build (3Mi, lock)	23m 8s
build (200Gi, various-transfer-part-size)	22m 6s
build (10Mi, various-transfer-part-size)	20m 0s
build (3Mi, !//)	37m 15s
build (3Mi, change-to-secondary)	26m 16s
	18h 5m 36s

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