Wait longer for push events

Sometimes Staging is slow, taking longer than 10 seconds to
return push events via the API.

qa/qa/resource/events/base.rb

@@ -3,7 +3,7 @@
 module QA
   module Resource
     module Events
-      MAX_WAIT = 10
+      MAX_WAIT = 60
       RAISE_ON_FAILURE = true
 
       EventNotFoundError = Class.new(RuntimeError)