Helper function for _process_info_installed_output()

    Converts an opkg attribute name to a standard attribute
    name which is used across 'pkg' modules.

def _convert_to_standard_attr(attr):
    '''
    Helper function for _process_info_installed_output()

    Converts an opkg attribute name to a standard attribute
    name which is used across 'pkg' modules.
    '''
    ret_attr = ATTR_MAP.get(attr, None)
    if ret_attr is None:
        # All others convert to lowercase
        return attr.lower()
    return ret_attr