core: add a break line before printing the ceph config

It's easier to read the config if there is a new line before instead
having a truncated version like:

```
2022-01-26 06:39:41.421373 D | cephclient: config file @ /etc/ceph/ceph.conf: [global]
fsid                = 0650a1d5-d688-4575-97fc-7b3052a8a3dd
mon initial members = a
mon host            = [v2:10.104.192.209:3300,v1:10.104.192.209:6789]

[client.admin]
keyring = /var/lib/rook/rook-ceph/client.admin.keyring
```

Now we have:

```
2022-01-26 06:39:41.421373 D | cephclient: config file @ /etc/ceph/ceph.conf:
[global]
fsid                = 0650a1d5-d688-4575-97fc-7b3052a8a3dd
mon initial members = a
mon host            = [v2:10.104.192.209:3300,v1:10.104.192.209:6789]

[client.admin]
keyring = /var/lib/rook/rook-ceph/client.admin.keyring
```

Signed-off-by: Sébastien Han <seb@redhat.com>

pkg/daemon/ceph/client/config.go

@@ -292,7 +292,7 @@ func WriteCephConfig(context *clusterd.Context, clusterInfo *ClusterInfo) error
 	}
 	dst, err := ioutil.ReadFile(DefaultConfigFilePath())
 	if err == nil {
-		logger.Debugf("config file @ %s: %s", DefaultConfigFilePath(), dst)
+		logger.Debugf("config file @ %s:\n%s", DefaultConfigFilePath(), dst)
 	} else {
 		logger.Warningf("wrote and copied config file but failed to read it back from %s for logging. %v", DefaultConfigFilePath(), err)
 	}