[Rule] Resource naming rules should not change

[vishrutshah]

This could result in failures which would have earlier succeeded. Even if the rules become less strict, clients relying on earlier name constraints to perform local validation will fail.

[vishrutshah]

Gaurav Bhatnagar (@ravbhatnagar) Could you please throw some thoughts on this rule when you get chance. That'd help me understand whether & how should I model the rule around this. Thanks