Add SettingsController cache reset to integration tests

[MAILPOET-1757]

tests/integration/Mailer/Methods/ErrorMappers/AmazonSESMapperTest.php

@@ -14,6 +14,7 @@ class AmazonSESMapperTest extends \MailPoetTest {
   private $response_data = [];
 
   function _before() {
+    parent::_before();
     $this->mapper = new AmazonSESMapper();
     $this->response_data = [
       'Error' => [

tests/integration/Mailer/Methods/ErrorMappers/MailPoetMapperTest.php

@@ -14,6 +14,7 @@ class MailPoetMapperTest extends \MailPoetTest {
   private $subscribers;
 
   function _before() {
+    parent::_before();
     $this->mapper = new MailPoetMapper();
     $this->subscribers = ['a@example.com', 'c d <b@example.com>'];
   }

tests/integration/Mailer/Methods/ErrorMappers/PHPMailMapperTest.php

@@ -10,6 +10,7 @@ class PHPMailMapperTest extends \MailPoetTest {
   private $mapper;
 
   function _before() {
+    parent::_before();
     $this->mapper = new PHPMailMapper();
   }
 

tests/integration/Mailer/Methods/ErrorMappers/SMTPMapperTest.php

@@ -11,6 +11,7 @@ class SMTPMapperTest extends \MailPoetTest {
   private $mapper;
 
   function _before() {
+    parent::_before();
     $this->mapper = new SMTPMapper();
   }
 

tests/integration/Mailer/Methods/ErrorMappers/SendGridMapperTest.php

@@ -13,6 +13,7 @@ class SendGridMapperTest extends \MailPoetTest {
   private $response = [];
 
   function _before() {
+    parent::_before();
     $this->mapper = new SendGridMapper();
     $this->response = [
       'errors' => [