static List<Delete> createDeletesForExistingNamespaceSnapshotSizes(Connection connection)
    throws IOException {
    return createDeletesForExistingSnapshotsFromScan(connection,
      createScanForNamespaceSnapshotSizes());
  }
Returns a list of {@code Delete} to remove all namespace snapshot entries from quota table.
@param connection connection to re-use
hbase-client/src/main/java/org/apache/hadoop/hbase/quotas/QuotaTableUtil.java