Fail mojo apptests with no GTest '[ RUN      ] <Suite.Fixture>' output.
Fail mojo apptests with no GTest '[ RUN      ] <Suite.Fixture>' output.

John enabled multiprocess on desktop mojo_runner with [reverted] CL:
  https://codereview.chromium.org/1434563004
This somehow made the harness lose its GTest output, but tests 'passed'.
The harness should fail fixture[s] without a '[ RUN      ]' output line.

Mark all attemped fixtures failed if no '[ RUN      ]' output is found.

Also, fix the DISABLED fixtures check for strings like 'Suite.Fixture'.

BUG=551083
TEST=Applying John's CL and running apptest_runner.py fails all tests.
R=sky@chromium.org

Review URL: https://codereview.chromium.org/1435733002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#359240}

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