letsencrypt: add max_fail_percentage to site.yml

Missed as letsencrypt landed just before max_fail_percentage [1][2].

[1] https://review.opendev.org/c/openstack/kolla-ansible/+/805598
[2] https://review.opendev.org/c/openstack/kolla-ansible/+/741340

Change-Id: I043b404f65b3faf22f73ca04c8d2417d99bae854
Signed-off-by: Bartosz Bezak <[email protected]>
(cherry picked from commit 9bc8527)

Author: bbezak

ansible/site.yml

@@ -331,6 +331,10 @@
     - letsencrypt
     - '&enable_letsencrypt_True'
   serial: '{{ kolla_serial|default("0") }}'
+  max_fail_percentage: >-
+    {{ letsencrypt_max_fail_percentage |
+       default(kolla_max_fail_percentage) |
+       default(100) }}
   roles:
     - { role: letsencrypt,
         tags: letsencrypt }