Fix INSTALL_K3S_PR support #1635

Job	Run time
Build Go Tests	55s
build / Build	6m 59s
Docker Tests (basics)	57s
E2E Tests (startup)	8m 47s
Docker Tests (bootstraptoken)	1m 3s
Docker Tests In GO (basics)	58s
E2E Tests (s3)	7m 58s
Docker Tests (cacerts)	47s
Docker Tests In GO (bootstraptoken)	54s
E2E Tests (btrfs)	4m 26s
Docker Tests (compat)	2m 22s
Docker Tests In GO (cacerts)	50s
E2E Tests (externalip)	4m 29s
Docker Tests (lazypull)	47s
Docker Tests In GO (etcd)	1m 52s
E2E Tests (privateregistry)	5m 22s
Docker Tests (upgrade)	2m 42s
Docker Tests In GO (lazypull)	1m 1s
E2E Tests (embeddedmirror)	5m 9s
Docker Tests In GO (skew)	1m 57s
E2E Tests (wasm)	4m 35s
Docker Tests In GO (upgrade)	1m 18s
	1h 6m 8s

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