Install ppc64-diag in ppc64le amphora images
Install ppc64-diag in ppc64le amphora images

This package provides rtas_errd which is necessary to process hotplug
events like VIP and member port attachments.

https://bugzilla.redhat.com/show_bug.cgi?id=1862726

Change-Id: I8b20602c5b075a6e47d3f7dc42a1bffb1b7a14ea

openstack/octavia,openstack/octavia,openstack/octavia