Fix agent tunnel address with dedicated supervisor port #1704

Job	Run time
Build Go Tests	1m 10s
build / Build	6m 54s
Docker Tests In GO (basics)	58s
Docker Tests In GO (bootstraptoken)	1m 8s
Docker Tests (basics)	58s
Docker Tests In GO (cacerts)	54s
E2E Tests (startup)	11m 52s
Docker Tests In GO (etcd)	1m 55s
E2E Tests (s3)	7m 44s
Docker Tests In GO (lazypull)	1m 8s
E2E Tests (btrfs)	5m 21s
Docker Tests (bootstraptoken)	42s
Docker Tests In GO (skew)	1m 48s
E2E Tests (externalip)	4m 39s
Docker Tests (cacerts)	1m 0s
E2E Tests (privateregistry)	5m 25s
E2E Tests (embeddedmirror)	4m 56s
Docker Tests In GO (upgrade)	1m 22s
Docker Tests (compat)	2m 21s
E2E Tests (wasm)	3m 59s
Docker Tests (lazypull)	48s
Docker Tests (upgrade)	2m 22s
	1h 9m 24s

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