ldap: abandon request does not wait for a response

Ticket: 8356

As such, abandon request is a complete tx

(cherry picked from commit 76d2925bdf)

rust/src/ldap/ldap.rs

@@ -513,6 +513,7 @@ fn tx_is_complete(op: &ProtocolOp, dir: Direction) -> bool {
     match dir {
         Direction::ToServer => match op {
             ProtocolOp::UnbindRequest => true,
+            ProtocolOp::AbandonRequest(_) => true,
             _ => false,
         },
         Direction::ToClient => match op {