During a rolling upgrade, when the new services are pinned to the
old release, the API version will also be pinned to the old release.
This will prevent users from accessing new features that may not quite
work.
The .sample was updated to reflect the change to the help string for
the [DEFAULT]/pin_release_version configuration option. The update also
pulled in changes for other options, from other (non-ironic) libraries.
Change-Id: I38a0f106b589945fb62071f3dfe5bff43c6fee93
Partial-Bug: #1708549
feac8cfb78