Truncate large outputs.

Iñaki Malerbarequested to merge
truncate-logs into master

Avoid Job's log exceeded maximum error.

output-filter is a simple python script that shows the head and tail of the output, trying to keep all the important information shown on the job's output.

Also, the full log is included as an artifact.

Replaces: !133 (closed) Fixes #110 (closed)

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