Allow listing of testsuite tests (a la mkcheck)

[Gabriel Dos Reis]

Phil Edwards <pedwards@disaster.jaj.com> writes:

| One of the things I liked using with mkcheck was the "mkcheckfiles"
| listing of source files.  If a testsuite run showed a problematic test,
| the generated mkcheckfiles could be trimmed down to that test(s).  Then the
| testsuite would only run those tests.

That feature normally falls under the philosophy of runtest_file_p
(from DejaGnu/utils.exp).

-- Gaby
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