Merge branch 'expose_postgres_bi' into 'master'

regles firewall

See merge request coopdevs/odoo-vertical-carsharing-inventory!10

inventory/host_vars/carsharing.coop/firewall.yml

+---
+# Enable firewall
+firewall_enabled: True
+
+firewall_allowed_tcp_ports:
+  - "22"  # for SSH
+  - "80"  # for HTTP. Nginx redirects it to 443
+  - "443" # for HTTPS.
+
+firewall_additional_rules:
+  - "iptables -A INPUT -p tcp --dport {{ expose_postgresql_port }} -s {{ bi_ip }} -j ACCEPT"