WIP Prepare postgres for migration by replication

site-cookbooks/kosmos_postgresql/files/list_subscriptions.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+for db in $(psql -Atqc "SELECT datname FROM pg_database WHERE datallowconn AND datname NOT IN ('template1')"); do
+  echo "==== DB: $db ===="
+  psql -d "$db" -c "SELECT * FROM pg_stat_subscription;"
+done