Rewriting to Python 3

[Cecil Westerhof]

On my system I have:
    PARSER_RE_STR = '/(%s)=' % '|'.join(DN_LUT.keys() + DN_LUT.values())
in:
    /usr/lib/python3.4/site-packages/ndg/httpsclient/ssl_peer_verification.py

In Python 3 that gives:
    TypeError: unsupported operand type(s) for +: 'dict_keys' and 'dict_values'

How should I rewrite this?

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof