[PATCH] fix "yum --help" with translated "Usage: %s\n". BZ 1033416

[Zdenek Pavlas]

>  Did you try undoing the _wrapOptParseUsage() stuff to see if that
> helped?

removing the callback=self._wrapOptParseUsage stuff didn't help,
in fact I'm not sure why it's there..

>  Is it worth just re-implementing self.optparser.format_usage() within
> yum/cli?

It's possible but quite hairy. format_usage() is not a method of OptionParser
(that we already subclass), but of IndentedHelpFormatter.  One can select
a different than the built-in formatter with OptionParse(formatter=...).

We'd have to override format_heading() too, since it uses _("Options")
(that apparently was not localized, otherwise we'd get a different traceback).
Patching optparse._ fixes both at once.