Handle bootstrap behavior in GCP template

Allow each node group to request bootstrap, allow per node group image
override, and ensure the provision logic does not wait for bootstrapping
node groups before continuing.

This is an incremental step to allow GCP clusters to use bootstrap logic
on cluster deploy without having fully baked images. We will switch over
slowly and ensure both code paths function.

roles/openshift_gcp/templates/provision.j2.sh

@@ -125,10 +125,11 @@ fi ) &
     if ! gcloud --project "{{ openshift_gcp_project }}" compute instance-templates describe "{{ openshift_gcp_prefix }}instance-template-{{ node_group.name }}" &>/dev/null; then
         gcloud --project "{{ openshift_gcp_project }}" compute instance-templates create "{{ openshift_gcp_prefix }}instance-template-{{ node_group.name }}" \
                 --machine-type "{{ node_group.machine_type }}" --network "{{ openshift_gcp_network_name }}" \
-                --tags "{{ openshift_gcp_prefix }}ocp,ocp,{{ node_group.tags }}" \
+                --tags "{{ openshift_gcp_prefix }}ocp,ocp,{{ 'ocp-bootstrap,' if (node_group.bootstrap | default(False)) else '' }}{{ node_group.tags }}" \
                 --boot-disk-size "{{ node_group.boot_disk_size }}" --boot-disk-type "pd-ssd" \
                 --scopes "logging-write,monitoring-write,useraccounts-ro,service-control,service-management,storage-ro,compute-rw" \
-                --image "${image}" ${metadata}
+                --image "{{ node_group.image | default('${image}') }}" ${metadata}  \
+                --metadata "bootstrap={{ node_group.bootstrap | default(False) | bool | to_json }},cluster-id={{ openshift_gcp_prefix + openshift_gcp_clusterid }},node-group={{ node_group.name }}"
     else
         echo "Instance template '{{ openshift_gcp_prefix }}instance-template-{{ node_group.name }}' already exists"
     fi
@@ -312,8 +313,12 @@ fi
 
 # wait until all node groups are stable
 {% for node_group in openshift_gcp_node_group_config %}
+{% if node_group.bootstrap | default(False) %}
+# not waiting for {{ node_group.name }} due to bootstrapping
+{% else %}
 # wait for stable {{ node_group.name }}
 ( gcloud --project "{{ openshift_gcp_project }}" compute instance-groups managed wait-until-stable "{{ openshift_gcp_prefix }}ig-{{ node_group.suffix }}" --zone "{{ openshift_gcp_zone }}" --timeout=600 ) &
+{% endif %}
 {% endfor %}