network: synchronously save state file when link is being reconfigured

src/network/networkd-link-bus.c

@@ -620,6 +620,12 @@ int bus_link_method_reconfigure(sd_bus_message *message, void *userdata, sd_bus_
         if (r < 0)
                 return r;
 
+        link_set_state(l, LINK_STATE_INITIALIZED);
+        r = link_save(l);
+        if (r < 0)
+                return r;
+        link_clean(l);
+
         return sd_bus_reply_method_return(message, NULL);
 }