grpc-js: Don't repeat fixed resolver results #2609
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This should fix #2604 (comment). PR #2602 changed pick_first behavior so that it would request a resolver update the first time every subchannel reported TRANSIENT_FAILURE after an address list update. With subchannel reuse, a subchannel could already be in TRANSIENT_FAILURE immediately after an address list update, so pick_first would request a resolver update immediately. The rate limit on DNS targets would rate limit that whole process, but the same is not true of IP targets, causing a tight loop that does nothing. IP targets will never return a different address list, so the result is to just not respond to resolver update requests. The flag is reset in the
destroyfunction because that is how channel idleness is handled, and an update is expected after that.