add IPv6 to cluster-dns Usage Docs #1792

Job	Run time
Build Go Tests	36s
build / Build	7m 30s
Docker Tests (basics)	1m 6s
Docker Tests (bootstraptoken)	50s
E2E Tests (startup)	12m 35s
Docker Tests (cacerts)	49s
Docker Tests In GO (basics)	54s
E2E Tests (s3)	8m 24s
Docker Tests (compat)	56s
Docker Tests In GO (bootstraptoken)	50s
E2E Tests (btrfs)	4m 14s
Docker Tests (lazypull)	45s
Docker Tests In GO (cacerts)	51s
E2E Tests (externalip)	4m 36s
Docker Tests (upgrade)	2m 29s
Docker Tests In GO (etcd)	2m 7s
E2E Tests (privateregistry)	5m 23s
Docker Tests In GO (lazypull)	53s
E2E Tests (embeddedmirror)	5m 40s
Docker Tests In GO (skew)	8s
E2E Tests (wasm)	3m 52s
Docker Tests In GO (upgrade)	1m 35s
	1h 7m 3s

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