tests: don't clutter the top-level dir with temporary test directories * t/self-check-me.tap: Be sure to initialize '$am_create_testdir' to "no" in all the shell invocations sourcing './defs'. Otherwise, when running the testsuite with 'keep_testdirs=yes', the following temporary director are left cluttering the top-level directory: ./012.dir ./abc..dir ./a.b.c.dir ./foo.dir ./foo.bar.dir ./foo-bar-.dir ./_foo__bar.dir Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>