distributed server is just that distributed servers. A vault on it’s own has no authority and cannot give you data, it must have authority provided by other vaults and so on. Semantically we can make a vault and elephant or zebra or something, but it’s all just playing with bad English I recon.
Perhaps in your example of consul /cockroachdb you can call them part servers or mini servers, not quite servers or serves that cannot alone serve you data, or confusingly call them servers. It’s just semantics.
We don’t want Are Safe Vaults servers or not: a discussion all over again 
We could call bitcoin nodes servers and argue the point like mad to those core devs, but they will just be full nodes to them.