storage: dir: .deleteVol callback for ploop volume

Recursively deletes whole directory of a ploop volume.
To delete ploop image it has to be unmounted.

Signed-off-by: Olga Krishtal <okrishtal@virtuozzo.com>

src/storage/storage_backend_fs.c

@@ -1264,6 +1264,9 @@ virStorageBackendFileSystemVolDelete(virConnectPtr conn ATTRIBUTE_UNUSED,
         }
         break;
     case VIR_STORAGE_VOL_PLOOP:
+        if (virFileDeleteTree(vol->target.path) < 0)
+            return -1;
+        break;
     case VIR_STORAGE_VOL_BLOCK:
     case VIR_STORAGE_VOL_NETWORK:
     case VIR_STORAGE_VOL_NETDIR: