connectionManager: fix shutdown

Since https://review.jami.net/c/ring-daemon/+/16668 handleControlPacket
contains a shared_ptr to the mxsock pimpl. This means that
closeConnectionsWith don't call the destructor like before and the
shutdown is not triggered. So, force the shutdown to be called
to fix testShutdownCallbacks() and call correctly all shutdown
callbacks.

Change-Id: I8aa8bec05650066261ac61d5fd42e1f20f99830a

src/jamidht/connectionmanager.cpp

@@ -868,6 +868,8 @@ ConnectionManager::closeConnectionsWith(const DeviceId& deviceId)
             info->ice_->cancelOperations();
             info->ice_->stop();
         }
+        if (info->socket_)
+            info->socket_->shutdown();
         info->responseCv_.notify_all();
         if (info->ice_) {
             std::unique_lock<std::mutex> lk {info->mutex_};