All blocking reasons for au test harness flakiness have been resolved. Removing try/catch from ctest so that we propagate the correct error code upon exit.
Change-Id: Iee1f09ade37ac7a590c2dbf4ebb96985818f1882
BUG=chromium-os:10434
TEST=Ran ctest unittests.
Review URL: http://codereview.chromium.org/5971009