Merge branch 'fix/pipeline-settings-page' into 'master'

Fix save button on pipelines settings page

## What does this MR do?

This MR fixes 'Save button' on pipeline settings page, which didn't change state to enabled after saving settings.

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing

## What are the relevant issue numbers?

Closes #23431

See merge request !6955

CHANGELOG.md

@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 
 ## 8.13.0 (2016-10-22)
 
+  - Fix save button on project pipeline settings page. (!6955)
   - Avoid race condition when asynchronously removing expired artifacts. (!6881)
   - Improve Merge When Build Succeeds triggers and execute on pipeline success. (!6675)
   - Respond with 404 Not Found for non-existent tags (Linus Thiel)

app/views/projects/pipelines_settings/show.html.haml

@@ -7,7 +7,7 @@
   .col-lg-9
     %h5.prepend-top-0
       Pipelines
-    = form_for @project, url: namespace_project_pipelines_settings_path(@project.namespace.becomes(Namespace), @project), remote: true, authenticity_token: true do |f|
+    = form_for @project, url: namespace_project_pipelines_settings_path(@project.namespace.becomes(Namespace), @project) do |f|
       %fieldset.builds-feature
         - unless @repository.gitlab_ci_yml
           .form-group

spec/features/pipelines_settings_spec.rb → spec/features/projects/settings/pipelines_settings_spec.rb

@@ -24,11 +24,12 @@ feature "Pipelines settings", feature: true do
   context 'for master' do
     given(:role) { :master }
 
-    scenario 'be allowed to change' do
+    scenario 'be allowed to change', js: true do
       fill_in('Test coverage parsing', with: 'coverage_regex')
       click_on 'Save changes'
 
       expect(page.status_code).to eq(200)
+      expect(page).to have_button('Save changes', disabled: false)
       expect(page).to have_field('Test coverage parsing', with: 'coverage_regex')
     end
   end