This conditional will ensure that, the first time pvc.conf is installed
(or, subsequent times, until it stabilizes), the legacy configs will not
be removed. Then, on the next run in which pvc.conf does not change,
they will be removed.
This should provide a safety valve during a 0.9.83 update with the
update-pvc-daemons playbook: if the update succeeds, on the next run,
the legacy configs will be purged; otherwise, they will still be present
and can be used for fallback just in case.
This probably isn't needed, but just in case I'd rather be safe.
Joshua Boniface
d59c9ce1ea