[PATCH] Enable four 27_io tests (was: Re: Untested testcases?!?)

[Benjamin Kosnik]

> I started with 27_io, found 4 untested tests, enabled them and rebuild/regression
> tested. No new failures (fiuuu!). Patch below. Ok?

Yep. As long as there are no new regressions just check all this stuff in.

Thanks for the sanity check....