UI ember engines (#6718)

Adds replication engine and core in-repo addon

ui/lib/replication/addon/engine.js

@@ -0,0 +1,27 @@
+import Engine from 'ember-engines/engine';
+import loadInitializers from 'ember-load-initializers';
+import Resolver from './resolver';
+import config from './config/environment';
+
+const { modulePrefix } = config;
+/* eslint-disable ember/avoid-leaking-state-in-ember-objects */
+const Eng = Engine.extend({
+  modulePrefix,
+  Resolver,
+  dependencies: {
+    services: [
+      'auth',
+      'flash-messages',
+      'namespace',
+      'replication-mode',
+      'router',
+      'store',
+      'version',
+      'wizard',
+    ],
+  },
+});
+
+loadInitializers(Eng, modulePrefix);
+
+export default Eng;