ceph: metadatadevice to not be added to osd data device list
ceph: metadatadevice to not be added to osd data device list

When the metadataDevice is specified, it was a regression that it was
being interpreted also as a data device. ceph-volume was failing
when the metadataDevice was added as both a data and metadata device.
So we ensure it is not added to the list of data devices.

Signed-off-by: Travis Nielsen <a8b474fdb3f77f44446f0ab9ddca8147b09b3a9e@redhat.com>

rook/rook,rook/rook,rook/nfs,rook/nfs,rook/rook,rook/rook,rook/nfs,rook/rook