directory-client: removing unused imports

common/clients/directory-client/src/presence/mod.rs

@@ -2,10 +2,8 @@ use crate::requests::presence_topology_get::PresenceTopologyGetRequester;
 use crate::{Client, Config, DirectoryClient};
 use log::*;
 use serde::{Deserialize, Serialize};
-use std::collections::HashSet;
 use std::convert::TryInto;
 use std::io;
-use std::net::ToSocketAddrs;
 use topology::coco;
 use topology::mix;
 use topology::provider;