(1.11) Fix flask-compress import

[branden]

High-level description

This is a 1.11 backport of #2829

Corresponding DC/OS tickets (obligatory)

These DC/OS JIRA ticket(s) must be updated (ideally closed) in the moment this PR lands:

• DCOS_OSS-2422 test_history_service is failing on master

Checklist for all PRs

• Added a comprehensible changelog entry to CHANGES.md or explain why this is not a user-facing change: This fixes an import, no other change is intended.
• Included a test which will fail if code is reverted but test is not. If there is no test please explain here: This fixes the unit tests for dcos-history.
• Read the DC/OS contributing guidelines
• Followed relevant code rules Rules for Packages and Systemd

Checklist for component/package updates:

If you are changing components or packages in DC/OS (e.g. you are bumping the sha or ref of anything underneath packages), then in addition to the above please also include:

• Change log from the last version integrated (this should be a link to commits for easy verification and review): example
• Test Results: [link to CI job test results for component]
• Code Coverage (if available): [link to code coverage report]

[branden]

@mesosphere-mergebot bump-ee

[branden]

@mesosphere-mergebot bump-ee

[branden]

@mesosphere-mergebot bump-ee

[orsenthil]

@mesosphere-mergebot bump-ee

[orsenthil]

@mesosphere-mergebot label ready for review

[d2iq-mergebot]

Enterprise Bump PR: mesosphere/dcos-enterprise/pull/2693

[orsenthil]

@mesosphere-mergebot override-status teamcity/dcos/test/aws/cloudformation/simple https://jira.mesosphere.com/browse/QUALITY-1975

[orsenthil]

@urbanserj / @mnaboka - Could you please review this and EE PR.

[orsenthil]

@mesosphere-mergebot label ship-it

[orsenthil]

@mesosphere-mergebot merge-it

[d2iq-mergebot]

Enterprise Bump PR mesosphere/dcos-enterprise/pull/2693, and the current PR #2830 are now merged.