Update l3 ovn schedulers (chance, leastloaded) to ensure that LRP gateways are distributed over chassis in the different eligible AZs.
Previous version already ensure that LRP gateways were scheduled over chassis in eligible AZs. But, depending on the deployment characteristics, all these chassis could be in the same AZ. In some use-cases, it could be needed to have LRP gateways in different AZs to be resilient on failures.
This patch re-order the list of eligible chassis to add a priority on selecting chassis in different AZs.
This should provide a solution for users who need to have their router gateways scheduled on chassis from different AZs.
Closes-Bug: #2030741
Change-Id: I72973abbb8b0f9cc5848fd3b4f6463c38c6595f8
a29ea3724e