xds: change ring_hash LB aggregation rule to handle transient_failure (1.46.x backport) #9094
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YifeiZhuang changed the title 
ejona86 approved these changes Apr 19, 2022
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per gRFC change grpc/grpc#29332:
Apply new aggregation rule: If there is at least one subchannel in state TRANSIENT_FAILURE and there are more than one subchannel, report state CONNECTING. If we hit this rule, proactively start a subchannel connection attempt.
backport of #9084