[Twisted-Python] db-based checker

[Stephen Waterbury]

Here's my checker I mentioned on irc just now, 'UserDbCredChecker',
which I've added to the web2 auth example ... as you can see,
it's pretty trivial, and it works with my twisted.web-based app,
so I'm puzzled why it doesn't work with the web2 auth example I've
added it to.

Sorry this isn't a runnable example, but just wanted to see if
there was anything obvious by inspection before I go and create
a runnable example -- which I'll do if necessary.

Thanks for any suggestions.

Steve

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