revert nameserver config option

app/Enums/ProductParams.php

@@ -27,6 +27,5 @@ class ProductParams
     const DOMAIN_BASE_SIZE          = 'domainBaseSize';
     const SWITCHER_ENABLED          = 'on';
     const SWITCHER_DISABLED         = 'off';
-    const MX_SERVER                 = 'mxserver';
 
 }

app/Traits/ServerParams.php

@@ -70,8 +70,6 @@ trait ServerParams
                 'serverpassword'   => decrypt($server->password) ? decrypt($server->password) : $server->password,
                 'serveraccesshash' => $server->accesshash,
                 'serverport'       => $server->port,
-                'ns1'              => $server->nameserver1ip,
-                'ns2'              => $server->nameserver2ip,
             ];
         }
 

app/UI/Admin/ProductConfiguration/Pages/Sections/ZimbraSettings.php

@@ -113,10 +113,6 @@ class ZimbraSettings extends BoxSectionExtended implements AdminArea
         $field->setDescription('description');
         $right->addField($field);
 
-        $field = new Text('mxserver');
-        $field->setDescription('description');
-        $right->addField($field);
-
         return $right;
     }
 }

app/UI/Admin/ProductConfiguration/Providers/ProductConfigurationDataProvider.php

@@ -109,7 +109,6 @@ class ProductConfigurationDataProvider extends BaseDataProvider implements Admin
         $this->data['login_link']         = Zimbra::DEFAULT_LOGIN_LINK;
         $this->data['domainMaxSize']      = Size::UNLIMITED;
         $this->data['domainBaseSize']     = Size::UNLIMITED;
-        $this->data['mxserver']           = ProductParams::MX_SERVER;
 
         /* available class of services*/
         $this->availableValues['cos_name'] = [