MAGETWO-86865: Stabilize functional tests on Jenkins

- Mark randomly failing tests as skipped so we can investigate further

Author: tjwiebell

dev/tests/acceptance/tests/functional/Magento/FunctionalTest/Analytics/Test/AdminConfigurationBlankIndustryCest.xml

@@ -16,6 +16,7 @@
             <severity value="NORMAL"/>
             <testCaseId value="MAGETWO-63981"/>
             <group value="analytics"/>
+            <group value="skip"/>
         </annotations>
         <after>
             <amOnPage stepKey="amOnLogoutPage" url="admin/admin/auth/logout/"/>

dev/tests/acceptance/tests/functional/Magento/FunctionalTest/Newsletter/Test/AdminAddImageToWYSIWYGNewsletterCest.xml

@@ -12,6 +12,7 @@
             <features value="Add Image to WYSIWYG of Newsletter"/>
             <stories value="Apply new WYSIWYG in Newsletter-MAGETWO-47309"/>
             <group value="newsletter"/>
+            <group value="skip"/>
             <title value="You should be able to add image to WYSIWYG Editor of Newsletter"/>
             <description value="You should be able to add image to WYSIWYG Editor Newsletter"/>
             <severity value="CRITICAL"/>