Unable to get continous output for ceph status --watch

The plugin not seems to handle commands with continuous output.
```
$ kubectl rook-ceph ceph status --watch
Info: running 'ceph' command with args: [status --watch]
<NO OUTPUT AFTER 60 SECONDS>
^C
```

An working example: 
```
$ kubectl -n rook-ceph exec -ti $(kubectl -n rook-ceph get pods -l app=rook-ceph-tools -o jsonpath="{.items[0].metadata.name}") -- ceph status --watch
```