[sestarnix] Use the correct separator between the test suite & case

Use a "." separator rather than "/" between the test-suite and
case parts of the test name, to match gTest.

Remove a lingering failure expectation that had not been matching
because of the separator difference.

Change-Id: Ie2a4860baf8a68191ef7a27e5b233e3fc3e774f1
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1488897
Fuchsia-Auto-Submit: Wez <wez@google.com>
Commit-Queue: Wez <wez@google.com>
Reviewed-by: Ambre Williams <ambre@google.com>
4 files changed