octavia-adoption: perform failover only on amphora LBs

During our tests, tobiko creates an ovn load balancer in the source
cloud.
ovn load balancers don't support failovers so they need to be skipped in
the "perform failover of existing load balancers" task.
Update the docs accordingly.

Author: gthiemonge

docs_user/modules/proc_performing-post-adoption-cleanup-of-load-balancers.adoc

@@ -21,12 +21,15 @@ $ alias openstack="oc exec -t openstackclient -- openstack"
 $ openstack loadbalancer create --vip-subnet-id public-subnet --name lb-post-adoption --wait
 ----
 
-. Trigger a failover for all existing load balancers to upgrade the amphorae virtual machines to use the new image and to establish connectivity with the new control plane:
+. Trigger a failover for all existing amphora load balancers to upgrade the amphorae virtual machines to use the new image and to establish connectivity with the new control plane:
 +
 ----
-$ openstack loadbalancer list -f value -c id | \
+$ openstack loadbalancer list -f value -c id --provider amphora | \
       xargs -r -n1 -P4 ${BASH_ALIASES[openstack]} loadbalancer failover --wait
 ----
++
+[NOTE]
+OVN load balancers don't support failover as they don't need to be updated during upgrades.
 
 . Delete old flavors that were migrated to the new control plane:
 +

tests/roles/dataplane_adoption/tasks/octavia_post.yaml

@@ -43,7 +43,7 @@
   ansible.builtin.shell: |
     {{ shell_header }}
     {{ octavia_header }}
-    ${BASH_ALIASES[openstack]} loadbalancer list -f value -c id --not-tag new | \
+    ${BASH_ALIASES[openstack]} loadbalancer list -f value -c id --not-tag new --provider amphora | \
       xargs -r -n1 -P4 ${BASH_ALIASES[openstack]} loadbalancer failover --wait
 
 - name: check for existing load balancer