updating wait function of test

wait_for_container.sh

 #!/bin/sh
-# waiting for the database to finish migration!
-sleep 60
-
-while [ -z $(docker ps -qf "name=emg-pvs_renderer") ]; do
-    >&2 echo "Container is unavailable - sleeping"
-    sleep 15
+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 echo "Collection is not created yet - sleeping"
+    sleep 20
   done
+