Fix infra_node deployment

- Do not deploy the router/registry when the infra_nodes variable is present
  but does not contain a list of infra nodes.

- use right node group and only set openshift_infra_nodes if group is present

playbooks/common/openshift-master/config.yml

@@ -170,10 +170,10 @@
       master_cert_subdir: master-{{ openshift.common.hostname }}
       master_cert_config_dir: "{{ openshift.common.config_base }}/master"
   - set_fact:
-      openshift_infra_nodes: "{{ hostvars | oo_select_keys(groups['nodes'])
+      openshift_infra_nodes: "{{ hostvars | oo_select_keys(groups['oo_nodes_to_config'])
                                  | oo_nodes_with_label('region', 'infra')
                                  | oo_collect('inventory_hostname') }}"
-    when: openshift_infra_nodes is not defined
+    when: openshift_infra_nodes is not defined and groups.oo_nodes_to_config | default([]) | length > 0
 
 - name: Configure master certificates
   hosts: oo_first_master
@@ -408,7 +408,6 @@
 - name: Configure service accounts
   hosts: oo_first_master
   vars:
-    accounts: ["router", "registry"]
   roles:
   - openshift_serviceaccounts
 
@@ -417,10 +416,17 @@
   vars:
     persistent_volumes: "{{ hostvars[groups.oo_first_master.0] | oo_persistent_volumes(groups) }}"
     persistent_volume_claims: "{{ hostvars[groups.oo_first_master.0] | oo_persistent_volume_claims }}"
+    attach_registry_volume: "{{ openshift.hosted.registry.storage.kind != None }}"
+    deploy_infra: "{{ openshift.master.infra_nodes | default(0) | length > 0 }}"
+  pre_tasks:
+  - set_fact:
+      nfs_host: "{{ groups.oo_nfs_to_config.0 }}"
+      registry_volume_path: "{{ hostvars[groups.oo_nfs_to_config.0].openshift.nfs.exports_dir + '/' + hostvars[groups.oo_nfs_to_config.0].openshift.nfs.registry_volume }}"
+    when: attach_registry_volume | bool
   roles:
   - role: openshift_persistent_volumes
     when: persistent_volumes | length > 0 or persistent_volume_claims | length > 0
   - role: openshift_router
-    when: openshift.master.infra_nodes is defined
+    when: deploy_infra | bool
   - role: openshift_registry
-    when: openshift.master.infra_nodes is defined and openshift.hosted.registry.storage.kind != None
+    when: deploy_infra | bool and attach_registry_volume | bool