This is mostly for testing: a lot of tests assume that there are no
existing pools. These tests relied on a config to turn off creating the
"device_health_metrics" pool which generally exists for any new Ceph
cluster. It would be better to make these tests tolerant of the new .mgr
pool but clearly there's a lot of these. So just convert the config to
make it work.
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>