Improve certificates role testability

Move certs source path to defaults and make other small re-factoring.

Issue-ID: OOM-1694

Change-Id: Ie0a4b543b40314dc5a7772dd4667b1ad218d3543
Signed-off-by: Samuli Silvius <s.silvius@partner.samsung.com>
diff --git a/ansible/roles/certificates/defaults/main.yml b/ansible/roles/certificates/defaults/main.yml
new file mode 100644
index 0000000..260ba96
--- /dev/null
+++ b/ansible/roles/certificates/defaults/main.yml
@@ -0,0 +1,4 @@
+---
+# Generate certs to local current dir where ansible in run (= playbook_dir)
+# After ansible run, dir can be deleted but idempotence is lost and certs are re-generated in next run
+certificates_local_dir: certs