Pathing fixup

Set carnegie local relative to carnegie secure, so we have to get the
prefixes right once only.

playbooks/edx-west/carnegie-prod-app.yml

@@ -12,7 +12,8 @@
     secure_dir: '../../../edx-secret/ansible'
     # this indicates the path to site-specific (with precedence)
     # things like nginx template files
-    local_dir:  '../../../../../../edx-secret/ansible/local'
+    #local_dir:  '../../../edx-secret/ansible/local'
+    local_dir: "{{secure_dir}}/local"
     not_prod: true
   vars_files:
     - "{{ secure_dir }}/vars/edxapp_carnegie_vars.yml"