[fuchsia] Simplify log-processing code. (#1022)
[fuchsia] Simplify log-processing code. (#1022)

We only need to call process_logs_and_crash when *fuzzing* (as opposed
to reproducing), since the processing is used to determine how to pull
down the testcase once fuzzing is complete.  Reproduction simply has a
testcase_path passed in.

Additionally, we modify the call to device.fetch() to simply store the
result in artifact_prefix directly, rather than results_output.
google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz