Revert "Remove redis"

[gthiemonge]

This reverts commit c102571.

TODO: reenable jobboard when python3-redis is included in the images

[openshift-ci]

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[gthiemonge]

/hold

holding until python3-redis RPM is available

[openshift-ci]

@gthiemonge: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/precommit-check	f91621a	link	true	/test precommit-check

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[openshift-merge-robot]

PR needs rebase.

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