[MERGE] Pass realm as a string rather than a one-tuple.

[Jelmer Vernooij]

The attached patch fixes a bug in the way realm is parsed at the moment
during Basic HTTP auth. Currently it ends up as a tuple because of the
way it is parsed, but ideally it should of course be a string.

We should ideally add a test for this, but I was unsure about *where*
this would have to be done.

Cheers,

Jelmer
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