[issue3982] support .format for bytes

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

> I don't think that b'...'.format() is a good idea. Programmers
> will continue to mix characters and bytes since .format() target
> are characters.

b''.format() would return bytes, not a string. This is also how it works
in 2.6.

I'm also not sold on implementing it, although it would be easy and I
can see a few uses for it. I think Martin's suggesting of encoding back
to ascii might be the best thing to do (that is, don't implement
b''.format()).

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