Merge branch 'sftp_logs' of gitlab.eox.at:esa/prism/vs into sftp_logs

wait_for_container.sh

 #!/bin/sh
 while [ -z $(docker exec -i $(docker ps -qf "name=emg-pvs_registrar") python3 /var/www/pvs/dev/pvs_instance/manage.py id list) ]; do
-  >&2 docker service ps --no-trunc emg-pvs_registrar
+  >&2 echo "Collection is not created yet - sleeping"
     sleep 20
   done