MC-168: Admin should be able to assign attributes to an attribute set

- updated mftf test

Author: jilu1

dev/tests/acceptance/tests/functional/Magento/FunctionalTest/Catalog/Test/AdminAssignProductAttributeToAttributeSetTest.xml

@@ -50,6 +50,7 @@
         <actionGroup ref="SaveAttributeSet" stepKey="SaveAttributeSet"/>
         <!-- Go to create new product page -->
         <amOnPage url="{{AdminProductCreatePage.url(AddToDefaultSet.attributeSetId, 'simple')}}" stepKey="navigateToNewProduct"/>
+        <waitForPageLoad stepKey="waitForPageLoad"/>
         <!-- Assert attribute can be used in product creation -->
         <seeElement selector="{{AdminProductFormSection.attributeLabel($$attribute.attribute[frontend_labels][0][label]$$)}}" stepKey="seeLabel"/>
     </test>