WIP: Keycloak: pin to legacy WildFly distribution

[pierreprinetti]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@pierreprinetti: The following tests 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/e2e-agnostic-upgrade	3c27e2d	link	true	/test e2e-agnostic-upgrade
ci/prow/e2e-agnostic-ipv6	3c27e2d	link	false	/test e2e-agnostic-ipv6
ci/prow/e2e-aws-single-node	3c27e2d	link	false	/test e2e-aws-single-node
ci/prow/e2e-operator	3c27e2d	link	true	/test e2e-operator

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