Decouple load balancing logic from address set #384
Merged
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Round-robin load balancing was previously coupled with the address set implementation and made it hard to use different load balancing algorithm.
This PR turns
RoundRobinAddressSet
into a simple concurrent set of addresses and moves load balancing logic into a separate component that takes list of available addresses and returns one that should be used next. This allows easier implementation of new load balancing algorithms. Rediscovery procedure will now not use load balancing and query routers in a known order (which is randomized by the database).