Merge branch 'improve-spinach-test-for-mr-submit' into 'master'

Add an expect call to prevent random Spinach failure

This should help prevent getting the error:

```
Unable to find field "merge_request_title
```

This was happening probably because it takes some time after the "Compare branches" button is hit before the "New merge request" page showed up.

See merge request !882

features/steps/project/forked_merge_requests.rb

@@ -42,6 +42,7 @@ class Spinach::Features::ProjectForkedMergeRequests < Spinach::FeatureSteps
     click_button "Compare branches"
+    expect(page).to have_content "New merge request"
     fill_in "merge_request_title", with: "Merge Request On Forked Project"
   end