[MERGE] Make the test suite pass when -Eallow_debug is used.

[Andrew Bennetts]

Vincent Ladeuil wrote:
[...]
> Banging again.
> 
> Damn it, I didn't see that one lands and can't remember how often
> I pestered about the inability to use -Dhttp while running some
> tests :-(

D'oh!  Oh well, now you know.  I hope it helps!  I've certainly found it
helpful to have -Dhpss enabled in tests from time to time.

>     Andrew> It's confusing to have unrelated failures appear when
>     Andrew> you turn debugging options on :)
> 
> But... where are the tests ? :D
> 
> BB:tweak

What test(s) do you have in mind?  A test that debug_flags are restored
by TestCase, whether or not they are cleared?

-Andrew.