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Basic credential checkers

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        @return: a L{Deferred} which will fire with a L{bytes} that identifies
        an avatar, an empty tuple to specify an authenticated anonymous user
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    toy.  If you need a simple credentials checker for a real application,
    see L{FilePasswordDB}.

    @cvar credentialInterfaces: Tuple of L{IUsernamePassword} and
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        @param users: Usernames and passwords to seed the database with.
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    A file-based, text-based username/password database.

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    the passwords are not stored plaintext, a hash function must be supplied
    to convert plaintext passwords to the form stored on disk and this
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        @type filename: L{str}
        @param filename: The name of the file from which to read username and
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        @type delim: L{bytes}
        @param delim: The field delimiter used in the file.

        @type usernameField: L{int}
        @param usernameField: The index of the username after splitting a
        line on the delimiter.

        @type passwordField: L{int}
        @param passwordField: The index of the password after splitting a
        line on the delimiter.

        @type caseSensitive: L{bool}
        @param caseSensitive: If true, consider the case of the username when
        performing a lookup.  Ignore it otherwise.

        @type hash: Three-argument callable or L{None}
        @param hash: A function used to transform the plaintext password
        received over the network to a format suitable for comparison
        against the version stored on disk.  The arguments to the callable
        are the username, the network-supplied password, and the in-file
        version of the password.  If the return value compares equal to the
        version stored on disk, the credentials are accepted.

        @type cache: L{bool}
        @param cache: If true, maintain an in-memory cache of the
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        Loads the credentials from the configured file.

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        Look up the credentials for a username.

        @param username: The username to look up.
        @type username: L{bytes}

        @returns: Two-tuple of the canonicalicalized username (i.e. lowercase
        if the database is not case sensitive) and the associated password
        value, both L{bytes}.
        @rtype: L{tuple}

        @raises KeyError: When lookup of the username fails.
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