Mount /usr/share/openstack-octavia-amphora-images into mistral-executor

With containerized undercloud, the Octavia playbook shipping with
tripleo-common can no longer install the octavia-amphora-image RPM
available in RHOSP-based environments as the yum repository list is
empty. Thus, the amphora QCOW2 file needs to be made available by the
undercloud base OS via a volume mount. This will also help in
uniformizing default placement of amphora images across different
OpenStack distributions.

Change Icae47e76f71b739cf0e1f5633b15432fd531e645 will close the loop.

Conflicts:
    docker/services/mistral-executor.yaml

Partial-Bug: #1800916

Change-Id: I84943a5e6e2b08baaf8e61a1cd9f2fe92286ad9a
(cherry picked from commit 70162488bf)

docker/services/mistral-executor.yaml

@@ -151,6 +151,11 @@ outputs:
               Log files from mistral containers can be found under
               /var/log/containers/mistral.
           ignore_errors: true
+        - name: create octavia-amphora-images directory
+          file:
+            path: /usr/share/openstack-octavia-amphora-images
+            state: directory
+            setype: svirt_sandbox_file_t
       upgrade_tasks:
         - when: step|int == 0
           tags: common

docker/services/octavia/octavia-deployment-config.yaml

@@ -42,10 +42,12 @@ parameters:
     type: string
     default: ''
   OctaviaAmphoraImageFilename:
-    description: Filename for the amphora image. Using the default of an empty
-                 string will cause a distro specific default to be used. (e.g.
+    description: Filename for the amphora image. Image files are expected to be
+                 located in directory /usr/share/openstack-octavia-amphora-images.
+                 Using the default of an empty string will cause a distro
+                 specific default to be used. (e.g.
                  /usr/share/openstack-octavia-amphora-images/amphora-x64-haproxy.qcow2
-                 on CentOS and /usr/share/rhosp-director-images/octavia-amphora.qcow2
+                 on CentOS and /usr/share/openstack-octavia-amphora-images/octavia-amphora.qcow2
                  on Red Hat Enterprise Linux).
     type: string
     default: ''

environments/undercloud.yaml

@@ -143,5 +143,6 @@ parameter_defaults:
       connect_timeout: 60
   MistralExecutorExtraVolumes:
     - /usr/share/ceph-ansible:/usr/share/ceph-ansible:ro
+    - /usr/share/openstack-octavia-amphora-images:/usr/share/openstack-octavia-amphora-images:ro
   NeutronMetadataProxySharedSecret: ''
   MetadataNATRule: true

releasenotes/notes/octavia-mount-amphora-images-dir-31da44a544628687.yaml

@@ -0,0 +1,14 @@
+---
+upgrade:
+  - |
+    Octavia amphora images are now expected to be located in directory
+    /usr/share/openstack-octavia-amphora-images on the undercloud node
+    for uniformization across different OpenStack distributions.
+deprecations:
+  - |
+    Ensure Octavia amphora image files are placed in directory
+    /usr/share/openstack-octavia-amphora-images on the undercloud node.
+fixes:
+  - |
+    Fix an issue where Octavia amphora images were not accessible during
+    overcloud deployment.