Reload instead of restart to apply plugin changes

Summary:
Now full restart is not required for applying plugin changes (install/uninstall/update). So this diff changes the behavior to use reload instead of restart in Plugin Manager and Auto Update Manager. It is much faster than full restart.

Changelog: faster reload after plugin install/uninstall/update.

Reviewed By: jknoxville

Differential Revision: D23706701

fbshipit-source-id: b2dcaf7768a5d47b3c967c17e090fa74884b3850

desktop/app/src/utils/reloadFlipper.tsx

@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {remote} from 'electron';
+export default () => remote.getCurrentWindow().reload();