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.

Goals:

• stop running Jessie-era Cucumber on our CI
• avoid confusion between what developers see locally and what our CI does (e.g. #16150-note_9)
• fix #16150
• unblock #10328

See #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

Related issues

• Related to #11739 (closed)
• Blocked by #10068 (closed)
• Blocks #16150
• Blocks #10328
• Blocks #17083 (closed)

Original created by @intrigeri on 17080 (Redmine)