Description of problem:
When ceph-volume batch report is already tried on configured OSDs which were configured using wal-dbs, ceph-volume returning RuntimeError saying devices were filtered in non-interactive mode

Version-Release number of selected component (if applicable):
ceph version 14.2.8-39.el7cp 

How reproducible:
Just tried once

Steps followed:
1. Configure cluster with at least once OSD with wal-devices
2. after OSD gets created successfully, run same command again

Actual results:
$ sudo ceph-volume lvm batch --bluestore --yes --prepare --osds-per-device 4 /dev/sdd --wal-devices /dev/sdd /dev/sdc --report --format=json
-->  RuntimeError: 2 devices were filtered in non-interactive mode, bailing out

Expected results:
ceph-volume must not return error if OSDs are running already

Additional info:
Tried on a node where wal-devices were not used
$ sudo ceph-volume lvm batch --bluestore --yes --prepare --osds-per-device 2 /dev/sdc /dev/sdb /dev/sdd --report --format=json
{
    "changed": false, 
    "osds": [], 
    "vgs": []
}