Do not fail when admin openrc file does not exist

Change-Id: If89bb28fa2e8cc615da21893201cc438d5b6ff05
Story: 2009323
Task: 43745

ansible/roles/public-openrc/tasks/main.yml

@@ -3,8 +3,10 @@
   slurp:
     src: "{{ kolla_config_path }}/admin-openrc.sh"
   register: admin_openrc
+  when: (kolla_config_path ~ '/admin-openrc.sh') is exists
 
 - name: Ensure a public OpenStack API environment file exists
   template:
     src: public-openrc.sh.j2
     dest: "{{ public_openrc_kolla_config_path }}/public-openrc.sh"
+  when: admin_openrc is not skipped

releasenotes/notes/fix-failure-to-generate-openrc-when-using-tags-c8e554173e0b9ac3.yaml

+---
+fixes:
+  - |
+    ``public-openrc.sh`` is now only generated if the ``admin-openrc.sh`` file
+    generated by Kolla Ansible exists. This fixes an issue where the task would
+    fail, when running in a clean environment, with a set of Kolla Ansible tags
+    that did not include the generation of ``admin-openrc.sh``. See `story
+    2009323 <https://storyboard.openstack.org/#!/story/2009323>`__.