[CORD-1530]
Make config file directory creation using become an optional step
Cleanup various incongruities in defaults

Change-Id: I6fb77ab1ccdf08a18468adbc59474f94d603fc11
diff --git a/roles/juju-setup/defaults/main.yml b/roles/juju-setup/defaults/main.yml
index a9c7e81..e01d658 100644
--- a/roles/juju-setup/defaults/main.yml
+++ b/roles/juju-setup/defaults/main.yml
@@ -8,6 +8,7 @@
 charm_versions: {}
 
 pki_dir: "{{ playbook_dir }}/pki"
+credentials_dir: "{{ playbook_dir }}/credentials"
 
 site_name: placeholder-sitename
 site_suffix: "{{ site_name }}.test"