PR#453 honor --quiet in list-tagged

Merges #453
https://pagure.io/koji/pull-request/453

Fixes #452
https://pagure.io/koji/issue/452

cli/koji

@@ -2922,7 +2922,8 @@ def anon_handle_list_tagged(options, session, args):
     if event:
         opts['event'] = event['id']
         event['timestr'] = time.asctime(time.localtime(event['ts']))
-        print("Querying at event %(id)i (%(timestr)s)" % event)
+        if not options.quiet:
+            print("Querying at event %(id)i (%(timestr)s)" % event)
 
     if options.rpms:
         rpms, builds = session.listTaggedRPMS(tag, **opts)