Fix INSTALL_K3S_PR support #1634

Job	Run time
Build Go Tests	1m 5s
build / Build	7m 2s
Docker Tests (basics)	1m 5s
Docker Tests (bootstraptoken)	41s
E2E Tests (startup)	9m 21s
Docker Tests (cacerts)	1m 3s
E2E Tests (s3)	7m 58s
Docker Tests (compat)	2m 25s
E2E Tests (btrfs)	4m 16s
Docker Tests (lazypull)	57s
Docker Tests In GO (basics)	1m 9s
E2E Tests (externalip)	4m 20s
Docker Tests (upgrade)	2m 17s
Docker Tests In GO (bootstraptoken)	52s
E2E Tests (privateregistry)	6m 33s
Docker Tests In GO (cacerts)	49s
E2E Tests (embeddedmirror)	5m 33s
Docker Tests In GO (etcd)	1m 55s
E2E Tests (wasm)	3m 54s
Docker Tests In GO (lazypull)	53s
Docker Tests In GO (skew)	1m 53s
Docker Tests In GO (upgrade)	1m 16s
	1h 7m 17s

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