Add RabbitMQ to Travis environment

Author: Volodymyr Kublytskyi

.travis.yml

@@ -11,6 +11,8 @@ addons:
   firefox: "46.0"
   hosts:
       - magento2.travis
+services:
+  - rabbitmq
 language: php
 php:
   - 7.0

dev/tests/integration/etc/install-config-mysql.travis.php.dist

@@ -16,4 +16,8 @@ return [
     'admin-email' => \Magento\TestFramework\Bootstrap::ADMIN_EMAIL,
     'admin-firstname' => \Magento\TestFramework\Bootstrap::ADMIN_FIRSTNAME,
     'admin-lastname' => \Magento\TestFramework\Bootstrap::ADMIN_LASTNAME,
+    'amqp-host' => 'localhost',
+    'amqp-port' => '5672',
+    'amqp-user' => 'guest',
+    'amqp-password' => 'guest',
 ];