Merge pull request #184 from cybozu-go/e2e-fix-loading-kvm-modules #861

Job	Run time
build (3Mi, full-backup)	10m 55s
build (3Mi, change-to-primary)	10m 3s
build (3Mi, incr-backup)	6m 46s
build (3Mi, change-to-secondary)	18m 31s
build (10Mi, various-transfer-part-size)	19m 15s
build (3Mi, backup-failure)	10m 22s
build (3Mi, change-to-standalone)	10m 10s
build (3Mi, !//)	1h 40m 43s
build (200Gi, various-transfer-part-size)	16m 44s
	3h 23m 29s

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