Migrate the ssp tests from regress to atf.

Of the 17 tests, 4 fail in both the regress and atf style. 3 additional
tests fails in atf that did NOT fail in regress: gets, fgets, and read.
I will inv

Migrate the ssp tests from regress to atf.

Of the 17 tests, 4 fail in both the regress and atf style. 3 additional
tests fails in atf that did NOT fail in regress: gets, fgets, and read.
I will investigate why, and update when I can, but it is still useful to
get these tests into the new format where they can be exercised.

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