'Get the absolute path to a prefix directory or file.
suffix: list of suffixes after the \'preconfigs\' directory to navigate to
E.g., [\'metrics\', \'abc\'] gives the path to
<tko>/preconfigs/metrics/abc'

def _get_preconfig_path(self, suffix):

    rel_path = os.path.join(os.path.dirname(__file__), 'preconfigs', *suffix)
    return os.path.abspath(rel_path)
