Send notification when snasphot is restored

Ref https://github.com/GNS3/gns3-gui/issues/1417

docs/notifications.rst

@@ -142,6 +142,12 @@ Project has been closed.
 .. literalinclude:: api/notifications/project.closed.json
 
 
+snapshot.restored
+--------------------------
+
+Snapshot has been restored
+
+.. literalinclude:: api/notifications/project.snapshot_restored.json
 
 log.error
 ---------

gns3server/controller/snapshot.py

@@ -79,6 +79,7 @@ class Snapshot:
         yield from self._project.delete_on_computes()
         # We don't send close notif to clients because the close / open dance is purely internal
         yield from self._project.close(ignore_notification=True)
+        self._project.controller.notification.emit("snapshot.restored", self.__json__())
         shutil.rmtree(os.path.join(self._project.path, "project-files"))
         with open(self._path, "rb") as f:
             project = yield from import_project(self._project.controller, self._project.id, f, location=self._project.path)

tests/controller/test_snapshot.py

@@ -94,6 +94,7 @@ def test_restore(project, controller, async_run):
     with patch("gns3server.config.Config.get_section_config", return_value={"local": True}):
         async_run(snapshot.restore())
 
+    assert "snapshot.restored" in [c[0][0] for c in controller.notification.emit.call_args_list]
     # project.closed notification should not be send when restoring snapshots
     assert "project.closed" not in [c[0][0] for c in controller.notification.emit.call_args_list]