Merge branch 'dispatcher-dashboard-issues' into 'master'

Refactor dispatcher dashboard issues path

See merge request gitlab-org/gitlab-ce!16305

app/assets/javascripts/dispatcher.js

@@ -205,6 +205,10 @@ import Activities from './activities';
             .catch(fail);
           break;
         case 'dashboard:issues':
+          import('./pages/dashboard/issues')
+            .then(callDefault)
+            .catch(fail);
+          break;
         case 'dashboard:merge_requests':
           projectSelect();
           initLegacyFilters();

app/assets/javascripts/pages/dashboard/issues/index.js

+import projectSelect from '~/project_select';
+import initLegacyFilters from '~/init_legacy_filters';
+
+export default () => {
+  projectSelect();
+  initLegacyFilters();
+};