Upgrade Cucumber on Jenkins isotesters
Once we’ve done #10068 (closed) we might be able to upgrade to Cucumber 2.x from Stretch, while we’re currently running 1.3 from Jessie.
- stop running Jessie-era Cucumber on our CI
- avoid confusion between what developers see locally and what our CI does (e.g. tails#16150 (comment 12284))
- fix tails#16150 (closed)
- unblock tails#10328
See tails#10328 for things that might need to happen at the same time.
Finally, as part of this ticket, we should revert eccc25460099522ad26d33c93f3d70601ae63ee9.
Feature Branch: puppet-tails:cucumber2, jenkins-jobs:cucumber2