jaymode 9d85f377c7 Test: update the branch logic for BWC tests
This commit updates the logic for determining which branch to use to make it consistent with the
logic in elasticsearch. This change means that testing BWC within the same major picks the correct
branch.

Original commit: elastic/x-pack-elasticsearch@2d75d15c41
2017-11-09 13:03:40 -07:00
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