Make default trigger factory generate an owner

And specify owners more clearly

spec/factories/ci/triggers.rb

 FactoryGirl.define do
   factory :ci_trigger_without_token, class: Ci::Trigger do
+    owner
+
     factory :ci_trigger do
       sequence(:token) { |n| "token#{n}" }
     end

spec/requests/api/triggers_spec.rb

@@ -8,8 +8,8 @@ describe API::Triggers do
   let!(:project) { create(:project, :repository, creator: user) }
   let!(:master) { create(:project_member, :master, user: user, project: project) }
   let!(:developer) { create(:project_member, :developer, user: user2, project: project) }
-  let!(:trigger) { create(:ci_trigger, project: project, token: trigger_token) }
-  let!(:trigger2) { create(:ci_trigger, project: project, token: trigger_token_2) }
+  let!(:trigger) { create(:ci_trigger, project: project, token: trigger_token, owner: user) }
+  let!(:trigger2) { create(:ci_trigger, project: project, token: trigger_token_2, owner: user2) }
   let!(:trigger_request) { create(:ci_trigger_request, trigger: trigger, created_at: '2015-01-01 12:13:14') }
 
   describe 'POST /projects/:project_id/trigger/pipeline' do
@@ -254,8 +254,6 @@ describe API::Triggers do
   describe 'POST /projects/:id/triggers/:trigger_id/take_ownership' do
     context 'authenticated user with valid permissions' do
       it 'updates owner' do
-        expect(trigger.owner).to be_nil
-
         post api("/projects/#{project.id}/triggers/#{trigger.id}/take_ownership", user)
 
         expect(response).to have_http_status(200)

spec/requests/api/v3/triggers_spec.rb

@@ -7,7 +7,10 @@ describe API::V3::Triggers do
   let!(:project) { create(:project, :repository, creator: user) }
   let!(:master) { create(:project_member, :master, user: user, project: project) }
   let!(:developer) { create(:project_member, :developer, user: user2, project: project) }
-  let!(:trigger) { create(:ci_trigger, project: project, token: trigger_token) }
+
+  let!(:trigger) do
+    create(:ci_trigger, project: project, token: trigger_token, owner: user)
+  end
 
   describe 'POST /projects/:project_id/trigger' do
     let!(:project2) { create(:project) }

spec/services/ci/create_pipeline_service_spec.rb

@@ -470,7 +470,8 @@ describe Ci::CreatePipelineService do
     context 'when ref is not protected' do
       context 'when trigger belongs to no one' do
         let(:user) {}
-        let(:trigger_request) { create(:ci_trigger_request) }
+        let(:trigger) { create(:ci_trigger, owner: nil) }
+        let(:trigger_request) { create(:ci_trigger_request, trigger: trigger) }
 
         it 'creates a pipeline' do
           expect(execute_service(trigger_request: trigger_request))