Refactor zones

- Rename "zonefile_setting" to "zone"
- Remove version

#475

spec/features/admin/dns/zones/new_spec.rb

@@ -0,0 +1,39 @@
+require 'rails_helper'
+
+RSpec.feature 'New zone in admin area' do
+  background do
+    sign_in_to_admin_area
+  end
+
+  scenario 'it creates new zone' do
+    open_list
+    open_form
+    fill_form
+    submit_form
+
+    expect(page).to have_text(t('admin.dns.zones.create.created'))
+  end
+
+  def open_list
+    click_link_or_button t('admin.menu.zones')
+  end
+
+  def open_form
+    click_link_or_button t('admin.dns.zones.index.new_btn')
+  end
+
+  def fill_form
+    fill_in 'zone_origin', with: 'test'
+    fill_in 'zone_ttl', with: '1'
+    fill_in 'zone_refresh', with: '1'
+    fill_in 'zone_retry', with: '1'
+    fill_in 'zone_expire', with: '1'
+    fill_in 'zone_minimum_ttl', with: '1'
+    fill_in 'zone_email', with: 'test@test.com'
+    fill_in 'zone_master_nameserver', with: 'test.test'
+  end
+
+  def submit_form
+    click_link_or_button t('admin.dns.zones.form.create_btn')
+  end
+end