For kolla, kolla-ansible and bifrost, we are now using a stackhpc/<release> branch
naming scheme rather than referencing tags in forked repos. It is recommended to
override these branches to specific tags for repeatable builds.
The Ironic Python Agent source version and tarball URLs have also been updated to
point to the pike release artifacts.
Finally, the kolla_openstack_release has been set to 5.0.0, following the
kolla-ansible second pike release candidate on which the stackhpc/pike branches
are currently based.
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