In agent, use same TFE_ADDRESS value as the integration tests

Author: nfagerlund

helper_test.go

@@ -121,7 +121,7 @@ func createAgent(t *testing.T, client *Client, org *Organization, agentPool *Age
 		"run", "-d",
 		"--env", "TFC_AGENT_TOKEN="+agentPoolToken.Token,
 		"--env", "TFC_AGENT_NAME="+"this-is-a-test-agent",
-		"--env", "TFC_ADDRESS="+"https://tfcdev-2c13224a.ngrok.io",
+		"--env", "TFC_ADDRESS="+DefaultConfig().Address,
 		"docker.mirror.hashicorp.services/hashicorp/tfc-agent:latest")
 
 	go func() {