examples: Fix event detail printing in python test

If there is only one detail string for a particular event, we need to pu
comma after the string otherwise the string itself will be taken as a
list and only its first character will be printed out. For example,

    myDomainEventCallback1 EVENT: Domain fedora17(12) Shutdown F

instead of the desired

    myDomainEventCallback1 EVENT: Domain fedora17(12) Shutdown Finished

examples/domain-events/events-python/event-test.py

@@ -443,12 +443,12 @@ def eventToString(event):
 def detailToString(event, detail):
     eventStrings = (
         ( "Added", "Updated" ),
-        ( "Removed" ),
+        ( "Removed", ),
         ( "Booted", "Migrated", "Restored", "Snapshot", "Wakeup" ),
         ( "Paused", "Migrated", "IOError", "Watchdog", "Restored", "Snapshot" ),
         ( "Unpaused", "Migrated", "Snapshot" ),
         ( "Shutdown", "Destroyed", "Crashed", "Migrated", "Saved", "Failed", "Snapshot"),
-        ( "Finished" )
+        ( "Finished", ),
         ( "Memory", )
         )
     return eventStrings[event][detail]