`put_sup_nodes` in `operations.rs` should return full list of remote nodes on error

[ikopylov]

Right now it returns only the first one: https://github.com/qoollo/bob/blob/master/bob/src/cluster/operations.rs#L255 With current logic this works, but in the future this can become a problem.

Additionally, it would be good to refactor Quorum::put_at_least to use HashSet<> for failed_nodes (like it is done in delete_on_nodes)