oss: Remove --error from travis commands
oss: Remove --error from travis commands

Problem / Solution

When Scalatests fail, they log at info level which means we don't have
enough details in our logs to diagnose problems. See [1] for example.

[1] https://s3.amazonaws.com/archive.travis-ci.org/jobs/159412682/log.txt

RB_ID=871128

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