minor variable fix and reuse + handle auditlog redirected to stdout

roles/kubernetes/master/templates/manifests/kube-apiserver.manifest.j2

@@ -193,12 +193,13 @@ spec:
       readOnly: true
 {% endif %}
 {% if kubernetes_audit %}
+{% if audit_log_path != "-" %}
     - mountPath: {{ audit_log_mountpath }}
       name: {{ audit_log_name }}
       Writable: true
+{% endif %}
     - mountPath: {{ audit_policy_mountpath }}
       name: {{ audit_policy_name }}
-      Writable: true
 {% endif %}
   volumes:
   - hostPath:
@@ -221,9 +222,11 @@ spec:
     name: rhel-ca-bundle
 {% endif %}
 {% if kubernetes_audit %}
+{% if audit_log_path != "-" %}
   - hostPath:
       path: {{ audit_log_hostpath }}
     name: {{ audit_log_name }}
+{% endif %}
   - hostPath:
       path: {{ audit_policy_hostpath }}
     name: {{ audit_policy_name }}