Moved snibox to role based playbook.

Restricted it to gondor host.
Moved back to postgres on the same host. This does away with the etc_hosts link, but kept the variable and playbook entry as a template if and when needed.

snibox/roles/nginx/handlers/main.yaml

@@ -0,0 +1,6 @@
+---
+# Handlers for Nginx role
+- name: Reload Nginx
+  service:
+    name: nginx
+    state: reloaded