Improve E2E Aftersuite cleanup #1999

Job	Run time
build / Build	6m 27s
Integration Tests (certrotation)	1m 20s
Integration Tests (etcdrestore)	1m 43s
Integration Tests (localstorage)	1m 27s
Integration Tests (startup)	6m 35s
Integration Tests (custometcdargs)	53s
Integration Tests (etcdsnapshot)	6m 42s
Integration Tests (kubeflags)	6m 28s
Integration Tests (longhorn)	2m 9s
Integration Tests (secretsencryption)	1m 28s
Integration Tests (flannelnone)	1m 4s
	36m 16s

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