NewValidation: Notify customers about the need to modify serviceBdRoutingDisable flag for PBR BD's

[joseph-yo]

(use upvote 👍 for attentions)

Validation Type

[ ] - Fault

[ ] - Config

[ ] - Bug

[ X] - Other

What needs to be validated

If the customer is upgrading from some pre-6.x version to 6.x we need to check for any service BD's in their config and if present, notify them about CSCwh71581. This isn't so much a bug as a behavior change that was poorly documented (filing doc bugs on it). Basically after upgrading to 6.x, traffic between service nodes in the same service BD that should be bridged is instead routed. This can break cluster communication between service devices (though normal PBR dataplane shouldn't be impacted).

If this issue is present, the customer needs to manually set serviceBdRoutingDisable to "yes" for the fvBD object. It is not exposed in the UI at this time so the customer needs to post the updated config.

Why it needs to be validated

This behavior change can break clustering traffic between service nodes within a service BD.

Additional context

Add any other context about the feature request here.