Flush stdout after last print statement.

roles/bodhi2/backend/files/koji-sync-listener.py

@@ -20,6 +20,7 @@ def handle(content):
     body = json.loads(body)
     package = body['repo']
     print("Operating on {package}".format(package=package))
+    sys.stdout.flush()
     # XXX If you modify this taglist.  Please also modify the other copy in
     # bodhi2/backend/tasks/main.yml
     taglist = 'f28 f27 f26 f25 f28-container f27-container f26-container f25-container f28-docker f27-docker f26-docker f25-docker epel7 dist-6E-epel module-package-list'