Add seeds for protected branches.

db/fixtures/development/16_protected_branches.rb

@@ -0,0 +1,12 @@
+Gitlab::Seeder.quiet do
+  admin_user = User.find(1)
+
+  Project.all.each do |project|
+    params = {
+      name: 'master'
+    }
+
+    ProtectedBranches::CreateService.new(project, admin_user, params).execute
+    print '.'
+  end
+end