Problem builder xblock juniper compatible version

[iamjazzar]

Configuration Pull Request

• Fixes RED-1824
• Related PRs: edx-platform#859

NOTE

I'm not sure about this change, but I saw the requirement defined here. If it's not related feel free to close the PR.

Make sure that the following steps are done before merging:

• [ ] A DevOps team member has approved the PR.
• [x] Are you adding any new default values that need to be overridden when this change goes live? If so:
  • [x] Update the appropriate internal repo (be sure to update for all our environments)
  • [x] If you are updating a secure value rather than an internal one, file a DEVOPS ticket with details.
  • [x] Add an entry to the CHANGELOG.
• [x] If you are making a complicated change, have you performed the proper testing specified on the Ops Ansible Testing Checklist? Adding a new variable does not require the full list (although testing on a sandbox is a great idea to ensure it links with your downstream code changes).

[iamjazzar]

Closing in favor of edx-configs#1052