Fix use of TLS variables

Author: markgoddard

roles/vault/defaults/main.yml

@@ -28,8 +28,8 @@ vault_config: >
         "address": "{{ vault_bind_address }}:8200",
         {% if vault_tls_key and vault_tls_cert %}
         "tls_min_version": "tls12",
-        "tls_key_file": "/vault/config/tls.key",
-        "tls_cert_file": "/vault/config/tls.cert"
+        "tls_key_file": "/vault/config/{{ vault_tls_key }}",
+        "tls_cert_file": "/vault/config/{{ vault_tls_cert }}"
         {% else %}
         "tls_disable": "true"
         {% endif %}