Prevent conflicting services starting

We either want to import a cluster and add a node, or register a cluster
and start installation. Never both. Record this in the systemd units.

Author: zaneb

data/data/agent/systemd/units/agent-add-node.service

@@ -2,9 +2,11 @@
 Description=Adds the current node to an already existing cluster
 Wants=network-online.target
 Requires=apply-host-config.service
+Conflicts=start-cluster-installation.service
 PartOf=assisted-service-pod.service
 After=network-online.target apply-host-config.service
 ConditionPathExists=/etc/assisted/node0
+ConditionPathExists=/etc/assisted/add-nodes.env
 
 [Service]
 EnvironmentFile=/usr/local/share/assisted-service/assisted-service.env

data/data/agent/systemd/units/agent-import-cluster.service.template

@@ -1,9 +1,11 @@
 [Unit]
 Description=Imports an already existing cluster
 Wants=network-online.target assisted-service.service
+Conflicts=agent-register-cluster.service
 PartOf=assisted-service-pod.service
 After=network-online.target assisted-service.service
 ConditionPathExists=/etc/assisted/node0
+ConditionPathExists=/etc/assisted/add-nodes.env
 
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n

data/data/agent/systemd/units/agent-register-cluster.service.template

@@ -1,9 +1,11 @@
 [Unit]
 Description=Service that registers the cluster
 Wants=network-online.target assisted-service.service
+Conflicts=agent-import-cluster.service
 PartOf=assisted-service-pod.service
 After=network-online.target assisted-service.service
 ConditionPathExists=/etc/assisted/node0
+ConditionPathExists=!/etc/assisted/add-nodes.env
 
 [Service]
 Environment=PODMAN_SYSTEMD_UNIT=%n

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

@@ -2,9 +2,11 @@
 Description=Service that starts cluster installation
 Wants=network-online.target
 Requires=apply-host-config.service
+Conflicts=agent-add-node.service
 PartOf=assisted-service-pod.service
 After=network-online.target apply-host-config.service
 ConditionPathExists=/etc/assisted/node0
+ConditionPathExists=!/etc/assisted/add-nodes.env
 
 [Service]
 EnvironmentFile=/usr/local/share/assisted-service/assisted-service.env