Make common.py python3 compatible

  """Extracts the contents of fn from input zipfile or directory into a file."""

  if isinstance(input_file, zipfile.ZipFile):

    tmp_file = MakeTempFile(os.path.basename(fn))

    with open(tmp_file, 'w') as f:

    with open(tmp_file, 'wb') as f:

      f.write(input_file.read(fn))

    return tmp_file

  else:

    prop_file = GetBootImageBuildProp(boot_img)

    if prop_file is None:

      return ''

    with open(prop_file) as f:

      return f.read().decode()

    with open(prop_file, "r") as f:

      return f.read()

  @staticmethod

  def _ReadPartitionPropFile(input_file, name):