paste.auth.grantip ipmap parsing borken

[mjpieters]

paste.auth.grantip.make_grantip parses out user:role lines into username and role variable, only to then discard the parsed values and storing the original unparsed line in the ipmap:

    for key, value in kw.items():
        if ':' in value:
            username, role = value.split(':', 1)
        else:
            username = value
            role = ''
        if username == '-':
            username = ''
        if role == '-':
            role = ''
        ip_map[key] = value

Replacing the last line with:

        ip_map[key] = (username, role)

fixes this issue, making the grantip filter actually usable.