Extending torture_assert_* macros

[Kamen Mazdrashki]

Hi list,
I want to introduce a torture_assert_*_fmt family of macros in torture.h,
which are to work much in the same way as DEBUG macro does.

I pushed first few commits in this direction here:
http://gitweb.samba.org/?p=kamenim/samba.git;a=shortlog;h=refs/heads/msds-intid-wip

In order to achieve this I had to introduce new public function
- torture_format_msg_helper()
to be used to format messages just by passing (format_string, .... params)
tuple
(neither talloc_asprintf() nor asprintf() has such simplified interface)

The thing is that I don't quite like to introduce a whole new public
function
just to be able to format messages in torture_assert_* macros.
Does anyone has an idea how to achieve same effect without implementing new
function?

--
Thanks,
Kamen