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e9802348b5
Replace std::vector<inet_address> with a small_vector of size 3 for replica sets (reflecting the common case of local reads, and the somewhat less common case of single-datacenter writes). Vectors used to describe topology changes are of size 1, reflecting that up to one node is usually involved with topology changes. At those counts and below we save an allocation; above those counts everything still works, but small_vector allocates like std::vector. In a few places we need to convert between std::vector and the new types, but these are all out of the hot paths (or are in a hot path, but behind a cache).