run_test hangs on MSYS

[pramsey]

the run_simple_test script hangs on the first test.

[pramsey]

The problem is "too many stdout pipes". Basically once you get to 16, things hang. The first time I fixed this was by turning a pile of sed calls into a single call. Then strk added a new grep call recently and that put us over the top this time. So I have turned some greps into equivalent single patterns.

[pramsey]

Fixed at r9661

[pramsey]

Another change slipped in there that breaks things in new ways. Removed at r9662