DistributedFileSystem.createErasureCodingZone should pass schema in FileSystemLinkResolver

  public void createErasureCodingZone(final Path path, final ECSchema schema)
      throws IOException {
    Path absF = fixRelativePart(path);
    new FileSystemLinkResolver<Void>() {
      @Override
      public Void doCall(final Path p) throws IOException,
          UnresolvedLinkException {
        dfs.createErasureCodingZone(getPathName(p), null);
        return null;
      }
    ...
    }.resolve(this, absF);
  }