Fixing spac/run_test.js to properly set the exit code.
Fixing spac/run_test.js to properly set the exit code.

This fixes the Travic CI build, https://travis-ci.org/google/lovefield.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=110401684

google/lovefield,google/lovefield,ralic/lovefield,google/lovefield,ralic/lovefield,ralic/lovefield