Fix setting domain in QA Auto DevOps specs

The domain name setting was not doing anything (as far as I could tell).
Now we set the input and save the form. This was a regression introduced
in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24580/diffs

app/views/clusters/clusters/_form.html.haml

@@ -28,7 +28,7 @@
 
   .form-group
     %h5= s_('ClusterIntegration|Base domain')
-    = field.text_field :base_domain, class: 'col-md-6 form-control js-select-on-focus'
+    = field.text_field :base_domain, class: 'col-md-6 form-control js-select-on-focus qa-base-domain'
     .form-text.text-muted
       - auto_devops_url = help_page_path('topics/autodevops/index')
       - auto_devops_start = '<a href="%{url}" target="_blank" rel="noopener noreferrer">'.html_safe % { url: auto_devops_url }
@@ -43,4 +43,4 @@
 
   - if can?(current_user, :update_cluster, @cluster)
     .form-group
-      = field.submit _('Save changes'), class: 'btn btn-success'
+      = field.submit _('Save changes'), class: 'btn btn-success qa-save-domain'

qa/qa/page/project/operations/kubernetes/show.rb

@@ -14,6 +14,11 @@ module QA
               element :ingress_ip_address, 'id="ingress-ip-address"' # rubocop:disable QA/ElementWithPattern
             end
 
+            view 'app/views/clusters/clusters/_form.html.haml' do
+              element :base_domain
+              element :save_domain
+            end
+
             def install!(application_name)
               within(".js-cluster-application-row-#{application_name}") do
                 page.has_button?('Install', wait: 30)
@@ -32,6 +37,14 @@ module QA
               # ip address is assigned for the ingress controller
               page.find('#ingress-ip-address', wait: 1200).value
             end
+
+            def set_domain(domain)
+              fill_element :base_domain, domain
+            end
+
+            def save_domain
+              click_element :save_domain
+            end
           end
         end
       end

qa/qa/resource/kubernetes_cluster.rb

@@ -12,10 +12,6 @@ module QA
         Page::Project::Operations::Kubernetes::Show.perform(&:ingress_ip)
       end
 
-      attribute :domain do
-        "#{ingress_ip}.nip.io"
-      end
-
       def fabricate!
         @project.visit!
 
@@ -53,6 +49,12 @@ module QA
             page.await_installed(:ingress) if @install_ingress
             page.await_installed(:prometheus) if @install_prometheus
             page.await_installed(:runner) if @install_runner
+
+            if @install_ingress
+              populate(:ingress_ip)
+              page.set_domain("#{ingress_ip}.nip.io")
+              page.save_domain
+            end
           end
         end
       end

qa/qa/specs/features/browser_ui/7_configure/auto_devops/create_project_with_auto_devops_spec.rb

@@ -40,7 +40,7 @@ module QA
 
             # Create and connect K8s cluster
             @cluster = Service::KubernetesCluster.new(rbac: rbac).create!
-            kubernetes_cluster = Resource::KubernetesCluster.fabricate! do |cluster|
+            Resource::KubernetesCluster.fabricate! do |cluster|
               cluster.project = @project
               cluster.cluster = @cluster
               cluster.install_helm_tiller = true
@@ -49,14 +49,11 @@ module QA
               cluster.install_runner = true
             end
 
-            kubernetes_cluster.populate(:ingress_ip)
             @project.visit!
             Page::Project::Menu.perform(&:click_ci_cd_settings)
             Page::Project::Settings::CICD.perform do |p|
               p.enable_auto_devops
             end
-
-            kubernetes_cluster.populate(:domain)
           end
 
           after(:all) do