fixed userdata, thanks again to Stefan ;)

demo4-scale-out.py

@@ -214,9 +214,18 @@ def main():
     #
     ###########################################################################
 
+    # https://git.openstack.org/cgit/openstack/faafo/plain/contrib/install.sh
+    # is currently broken, hence the "rabbitctl" lines were added in the example
+    # below, see also https://bugs.launchpad.net/faafo/+bug/1679710
+    #
+    # Thanks to Stefan Friedmann for finding this fix ;)
+
     userdata = '''#!/usr/bin/env bash
     curl -L -s https://git.openstack.org/cgit/openstack/faafo/plain/contrib/install.sh | bash -s -- \
         -i database -i messaging
+    rabbitmqctl add_user faafo guest
+    rabbitmqctl set_user_tags faafo administrator
+    rabbitmqctl set_permissions -p / faafo ".*" ".*" ".*"
     '''
 
     print('Starting new app-services instance and wait until it is running...')