Switch to using kubelet config file for all supported flags #1773

Job	Run time
Build Go Tests	54s
build / Build	6m 52s
Docker Tests (basics)	54s
Docker Tests (bootstraptoken)	41s
E2E Tests (startup)	12m 14s
Docker Tests In GO (basics)	54s
Docker Tests (cacerts)	43s
E2E Tests (s3)	10m 10s
Docker Tests In GO (bootstraptoken)	52s
E2E Tests (btrfs)	5m 35s
Docker Tests (compat)	2m 25s
Docker Tests In GO (cacerts)	49s
E2E Tests (externalip)	4m 30s
Docker Tests (lazypull)	40s
Docker Tests In GO (etcd)	1m 50s
E2E Tests (privateregistry)	5m 19s
Docker Tests (upgrade)	2m 25s
Docker Tests In GO (lazypull)	1m 5s
E2E Tests (embeddedmirror)	5m 1s
Docker Tests In GO (skew)	2m 4s
E2E Tests (wasm)	3m 54s
Docker Tests In GO (upgrade)	1m 12s
	1h 11m 3s

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