qa/cephadm: add test that deploys raw OSDs

qa/cephadm: add test that deploys raw OSDs

The test relies on the fact that
'ceph-volume lvm list' returns a nonzero
rc when there are no lvm OSDs present

```
root@smithi156:/# ceph-volume lvm list
No valid Ceph lvm devices found
root@smithi156:/# echo $?
1
```

with lvm OSDs present, it will instead
reports on the lvs and give a zero rc

```
root@smithi097:/# ceph-volume lvm list

====== osd.0 =======

  [block]       /dev/ceph-ffeadaf4-...

...

root@smithi097:/# echo $?
0
```

Assuming the override this test has works
properly and all the OSDs we see are raw,
we can use the nonzero rc to confirm the
OSDs ar raw

Signed-off-by: Adam King <adking@redhat.com>