Backport 1.9: Support go-sockaddr templates in top-level cluster_addr config (#13678) #13706
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In doing some testing I found that the listener clusteraddr isn't really used, or at least isn't as important as the top-level clusteraddr setting. As such, go-sockaddr templating needs to be implemented for the top-level
cluster_addr
setting or it's unusable for HA.Also fix a nil pointer panic I discovered at the same time.