Make connections volatile instead of removing them

This keeps the profile up in Network Manager for
persistent_state:absent.

module_utils/network_lsr/utils.py

@@ -126,6 +126,29 @@ class Util:
     def create_cancellable(cls):
         return cls.Gio().Cancellable.new()
 
+    @classmethod
+    def create_callback(cls, finish_method):
+        """
+        Create a callback that will return the result of the finish method and
+        quit the GMainLoop
+
+        :param finish_method str: Name of the finish method to call from the
+        source object in the callback
+        """
+
+        def callback(source_object, res, user_data):
+            success = None
+            try:
+                success = getattr(source_object, finish_method)(res)
+            except Exception as e:
+                if cls.error_is_cancelled(e):
+                    return
+                user_data["error"] = str(e)
+            user_data["success"] = success
+            cls.GMainLoop().quit()
+
+        return callback
+
     @classmethod
     def error_is_cancelled(cls, e):
         GLib = cls.GLib()