swarm: Remove NotifyHandler::All (#1880)

Remove `NotifyHandler::All` thus removing the requirement for events
send from a `NetworkBehaviour` to a `ProtocolsHandler` to be `Clone`. An
implementor of `NetworkBehaviour` can still notify all
`ProtocolHandler`s for a given peer by emitting one `NotifyHandler`
event per connection to that peer.

protocols/kad/src/handler.rs

@@ -329,7 +329,7 @@ impl From<ProtocolsHandlerUpgrErr<io::Error>> for KademliaHandlerQueryErr {
 }
 
 /// Event to send to the handler.
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub enum KademliaHandlerIn<TUserData> {
     /// Resets the (sub)stream associated with the given request ID,
     /// thus signaling an error to the remote.
@@ -429,7 +429,7 @@ pub enum KademliaHandlerIn<TUserData> {
 
 /// Unique identifier for a request. Must be passed back in order to answer a request from
 /// the remote.
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq)]
 pub struct KademliaRequestId {
     /// Unique identifier for an incoming connection.
     connec_unique_id: UniqueConnecId,

protocols/request-response/src/handler/protocol.rs

@@ -118,7 +118,7 @@ where
 /// Request substream upgrade protocol.
 ///
 /// Sends a request and receives a response.
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub struct RequestProtocol<TCodec>
 where
     TCodec: RequestResponseCodec