ensure topic is always lower case

Author: vaimo-wilko

app/code/Magento/WebapiAsync/Model/Config.php

@@ -158,7 +158,7 @@ private function generateLookupKeyByRouteData($routeUrl, $httpMethod)
     private function generateTopicNameFromService($serviceInterface, $serviceMethod, $httpMethod)
     {
         $typeName = strtolower(sprintf('%s.%s', $serviceInterface, $serviceMethod));
-        return self::TOPIC_PREFIX . $this->generateKey($typeName, $httpMethod, '\\', false);
+        return strtolower(self::TOPIC_PREFIX . $this->generateKey($typeName, $httpMethod, '\\', false));
     }
 
     /**

app/code/Magento/WebapiAsync/Test/Unit/Model/ConfigTest.php

@@ -77,13 +77,13 @@ public function testGetServicesSetsTopicFromServiceContractName()
             'async.V1.products.POST' => [
                 'interface' => 'Magento\Catalog\Api\ProductRepositoryInterface',
                 'method' => 'save',
-                'topic' => 'async.magento.catalog.api.productrepositoryinterface.save.POST',
+                'topic' => 'async.magento.catalog.api.productrepositoryinterface.save.post',
             ]
         ];
         */
         $result = $this->config->getServices();
 
-        $expectedTopic = 'async.magento.catalog.api.productrepositoryinterface.save.POST';
+        $expectedTopic = 'async.magento.catalog.api.productrepositoryinterface.save.post';
         $lookupKey = 'async.V1.products.POST';
         $this->assertArrayHasKey($lookupKey, $result);
         $this->assertEquals($result[$lookupKey]['topic'], $expectedTopic);

dev/tests/integration/testsuite/Magento/AsynchronousOperations/Model/MassScheduleTest.php

@@ -128,7 +128,7 @@ public function sendBulk($products)
         }
         $this->clearProducts();
 
-        $result = $this->massSchedule->publishMass('async.magento.catalog.api.productrepositoryinterface.save.POST', $products);
+        $result = $this->massSchedule->publishMass('async.magento.catalog.api.productrepositoryinterface.save.post', $products);
 
         //assert bulk accepted with no errors
         $this->assertFalse($result->isErrors());
@@ -206,7 +206,7 @@ public function testScheduleMassOneEntityFailure($products)
 
             $expectedErrorMessage = "Data item corresponding to \"product\" " .
                 "must be specified in the message with topic " .
-                "\"async.magento.catalog.api.productrepositoryinterface.save.POST\".";
+                "\"async.magento.catalog.api.productrepositoryinterface.save.post\".";
             $this->assertEquals(
                 $expectedErrorMessage,
                 $reasonException->getMessage()