MAGETWO-55695: Remove saving order from Creditmemo repository save

Author: valdislav

app/code/Magento/Sales/Model/Service/CreditmemoService.php

@@ -160,7 +160,7 @@ public function refund(
         $this->validateForRefund($creditmemo);
         $creditmemo->setState(\Magento\Sales\Model\Order\Creditmemo::STATE_REFUNDED);
 
-        $connection = $this->getResource()->getConnectionByName('sales');
+        $connection = $this->getResource()->getConnection('sales');
         $connection->beginTransaction();
         try {
             $order = $this->getPaymentAdapter()->refund(

app/code/Magento/Sales/Test/Unit/Model/Service/CreditmemoServiceTest.php

@@ -248,7 +248,7 @@ public function testRefund()
         $adapterMock = $this->getMockBuilder(\Magento\Framework\DB\Adapter\AdapterInterface::class)
             ->disableOriginalConstructor()
             ->getMockForAbstractClass();
-        $resourceMock->expects($this->once())->method('getConnectionByName')->with('sales')->willReturn($adapterMock);
+        $resourceMock->expects($this->once())->method('getConnection')->with('sales')->willReturn($adapterMock);
         $adapterMock->expects($this->once())->method('beginTransaction');
         $paymentAdapterMock->expects($this->once())
             ->method('refund')