MAGETWO-61850: UI Upgrade Test failure when no other components to upgrade

  - renamed upgrade events_preset to debug

Author: Oleksii Korshenko

dev/tests/functional/etc/events.xml

@@ -43,7 +43,7 @@
             <tag name="webapi_failed" />
         </observer>
     </preset>
-    <preset name="upgrade" extends="base">
+    <preset name="debug" extends="base">
         <observer class="Magento\Mtf\System\Observer\Screenshot">
             <tag name="exception"/>
             <tag name="failure"/>