Add auto import images for containerd image store #335

Job	Run time
build / Build	6m 54s
Integration Tests (certrotation)	2m 42s
Integration Tests (cacertrotation)	2m 47s
Integration Tests (etcdrestore)	2m 50s
Integration Tests (localstorage)	2m 31s
Integration Tests (startup)	7m 30s
Integration Tests (custometcdargs)	1m 38s
Integration Tests (etcdsnapshot)	8m 21s
Integration Tests (kubeflags)	7m 43s
Integration Tests (longhorn)	3m 33s
Integration Tests (secretsencryption)	2m 59s
Integration Tests (flannelnone)	2m 5s
	51m 33s

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