Also cover reboot warning #2241

Job	Run time
build / Build	6m 39s
Integration Tests (certrotation)	1m 38s
Integration Tests (cacertrotation)	1m 40s
Integration Tests (etcdrestore)	1m 43s
Integration Tests (localstorage)	1m 29s
Integration Tests (startup)	6m 28s
Integration Tests (custometcdargs)	1m 2s
Integration Tests (etcdsnapshot)	8m 22s
Integration Tests (kubeflags)	6m 54s
Integration Tests (longhorn)	2m 44s
Integration Tests (secretsencryption)	2m 45s
Integration Tests (flannelnone)	1m 37s
	43m 1s

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