rebalance the travis builds

Change-Id: Ibe0bef85124cbbf52e4daee9ba3c2b0597781582
Reviewed-on: https://gerrit.instructure.com/29199
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>