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990c7a209f
Pass a change diff into the notification callback, rather than add or remove servers one by one, so that if we need to persist the state, we can do it once per configuration change, not for every added or removed server. For now still pass added and removed entries in two separate calls per a single configuration change. This is done mainly to fulfill the library contract that it never sends messages to servers outside the current configuration. The group0 RPC implementation doesn't need the two calls, since it simply marks the removed servers as expired: they are not removed immediately anyway, and messages can still be delivered to them. However, there may be test/mock implementations of RPC which could benefit from this contract, so we decided to keep it.