Simple framework for regression tests in src/tools/regression

[Joseph Koshy]

> When I converted the test program for the posix shm stuff over to a regression
> test I added some framework bits to manage the output format prove(1)
> expects.
...snip...
> Anyways, comments, etc.?

You could just use TET; its small, easy to use, compatibly licensed,
stable, offers
reasonable reporting, has a substantial user base.   TET can also do
far more than
the typical 'home brew' test harness, if ever there is a need for that power.

Regards,
Koshy