Add postgres role

Or rather rip it out of netbox. Improve DB password handling.

roles/netbox/tasks/main.yml

@@ -1,8 +1,12 @@
-- name: Set variables
-  set_fact:
-    user: '{{ user | default("netbox") }}'
-    database: '{{ database | default("netbox") }}'
-    db_password: '{{ lookup("password", "/dev/null", chars=["ascii_letters", "digits"]) }}'
+- name: Install redis
+  package:
+    name: redis
+
+- name: Enable redis service
+  service:
+    name: redis
+    enabled: true
+    state: started
 
 - name: Create group for web service
   group:
@@ -18,8 +22,5 @@
     system: yes
   register: user_info
 
-- name: Set up database
-  import_tasks: db.yml
-
 - name: Set up app
   import_tasks: app.yml