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This adds a custom ansible-lint rule at .rules/ZuulJobsNamespaceLoopVar.py that enforces the loop var policy described at: https://zuul-ci.org/docs/zuul-jobs/policy.html#ansible-loops-in-roles It also updates existing roles to follow the policy. Change-Id: I92b2ff56a1c2702542fc07b316f1809087a4c92f