Dimitrios Liappis 1fea75cc4f Refactor ci script to choose test based on single cli arg
We prefer just passing a single cli argument that allows the script to
choose the corresponding gradle command from a preset list of
choices. For now, valid options are `packagingtests` or `tests`. The
script defaults to `tests` if no argument is supplied.

Original commit: elastic/x-pack-elasticsearch@f6315b1ad5
2016-11-23 13:44:15 +02:00
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