AGENT-193: Do not set api_vip for SNO cluster

data/ignition/files/usr/local/bin/start-cluster-installation.sh

@@ -39,10 +39,12 @@ done
 
 echo "All ${total_required_nodes} hosts are ready."
 
-api_vip=$(curl -s -S "${BASE_URL}/clusters" | jq -r .[].api_vip)
-if [ "${api_vip}" == null ]; then
-    echo "Setting api vip"
-    curl -s -S -X PATCH "${BASE_URL}/clusters/${cluster_id}" -H "Content-Type: application/json" -d '{"api_vip": "{{.APIVIP}}"}'
+if [[ "$total_required_nodes" > "1" ]]; then
+    api_vip=$(curl -s -S "${BASE_URL}/clusters" | jq -r .[].api_vip)
+    if [ "${api_vip}" == null ]; then
+        echo "Setting api vip"
+        curl -s -S -X PATCH "${BASE_URL}/clusters/${cluster_id}" -H "Content-Type: application/json" -d '{"api_vip": "{{.APIVIP}}"}'
+    fi
 fi
 
 while [[ "${cluster_status}" != "ready" ]]

data/ignition/systemd/units/start-cluster-installation.service

@@ -1,14 +1,16 @@
 [Unit]
 Description=Service that starts cluster installation
-Wants=network-online.target create-cluster-and-infra-env.service
-After=network-online.target create-cluster-and-infra-env.service
+Wants=network-online.target assisted-service.service
+PartOf=assisted-service-pod.service
+After=network-online.target assisted-service.service
 ConditionPathExists=/etc/assisted-service/node0
 
 [Service]
 ExecStart=/usr/local/bin/start-cluster-installation.sh
 
 KillMode=none
 Type=oneshot
+RemainAfterExit=true
 
 
 [Install]