Nurhan Turgut 7b1df2e596 Change the repo fetch script used in integration tests (flutter/engine#17943)
* change the repo fetch script to recognize candidate versions such as flutter-1.17-candidate.3. Originally the script only accepted branches such as v0.7.3 as valid engine branches.

* addressing reviewer comments: changing the release regular expression
2020-04-24 17:08:39 -07:00
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