Fix INSTALL_K3S_PR support #2269

Job	Run time
build / Build	6m 43s
Integration Tests (certrotation)	2m 1s
Integration Tests (cacertrotation)	2m 3s
Integration Tests (etcdrestore)	2m 16s
Integration Tests (localstorage)	1m 4s
Integration Tests (startup)	7m 26s
Integration Tests (custometcdargs)	26s
Integration Tests (etcdsnapshot)	7m 54s
Integration Tests (kubeflags)	6m 26s
Integration Tests (longhorn)	2m 54s
Integration Tests (secretsencryption)	2m 11s
Integration Tests (flannelnone)	1m 4s
	42m 28s

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