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Support load balancing between several tarantool instances #246

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@Totktonada

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@Totktonada

Now we have the cluster client that supports failover, but it does not allow to balance a load between several tarantool instances. Users often ask for this, however.

We however provide some guarantees: say, that sync requests will be executed in order. Or that JDBC's batch updates (as well as async requests) will be in order under some circumstances: mainly it is using of memtx engine and don't have DDL requests in a batch.

We should not break those guarantees for existing singletone and cluster client: at least we should do this under a certain option and cleanly state which kinds of assumptions will fails when requests are balanced over instances.

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