conf: Remove volOptions for VIR_STORAGE_POOL_RBD

The rbd pool is documented as not using the volume type,
so let's just remove it.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
ACKed-by: NMichal Privoznik <mprivozn@redhat.com>

src/conf/storage_conf.c

@@ -237,11 +237,6 @@ static virStoragePoolTypeInfo poolTypeInfo[] = {
                    VIR_STORAGE_POOL_SOURCE_NETWORK |
                    VIR_STORAGE_POOL_SOURCE_NAME),
       },
-      .volOptions = {
-          .defaultFormat = VIR_STORAGE_FILE_RAW,
-          .formatFromString = virStorageVolumeFormatFromString,
-          .formatToString = virStorageFileFormatTypeToString,
-      }
     },
     {.poolType = VIR_STORAGE_POOL_SHEEPDOG,
      .poolOptions = {