Require nameserver only if "nameserver_required" setting is on

#267

app/controllers/epp/domains_controller.rb

@@ -157,8 +157,10 @@ class Epp::DomainsController < EppController
   end
 
   def validate_create
-    @prefix = 'create > create >'
-    requires 'name', 'ns', 'registrant', 'ns > hostAttr'
+    if Domain.nameserver_required?
+      @prefix = 'create > create >'
+      requires 'name', 'ns', 'registrant', 'ns > hostAttr'
+    end
 
     @prefix = 'extension > create >'
     mutually_exclusive 'keyData', 'dsData'

app/models/domain.rb

@@ -245,6 +245,10 @@ class Domain < ActiveRecord::Base
         { admin_contacts: :registrar }
       )
     end
+
+    def nameserver_required?
+      Setting.nameserver_required
+    end
   end
 
   def name=(value)

spec/models/domain_spec.rb

@@ -704,6 +704,16 @@ RSpec.describe Domain, db: false do
   it { is_expected.to alias_attribute(:force_delete_time, :force_delete_at) }
   it { is_expected.to alias_attribute(:outzone_time, :outzone_at) }
 
+  describe '::nameserver_required?' do
+    before do
+      Setting.nameserver_required = 'test'
+    end
+
+    it 'returns setting value' do
+      expect(described_class.nameserver_required?).to eq('test')
+    end
+  end
+
   describe '::expire_warning_period', db: true do
     before :example do
       Setting.expire_warning_period = 1