Monitor the HTTPS cert for id.openinfra.dev

The OpenStackID project has been rebranded, and the old
openstackid.org deployment is being retained temporarily in order to
ease transition, but id.openinfra.dev is in place now and intended
as its successor.

Monitor its HTTPS cert like we do for its predecessor, so we'll be
aware of any impending expiration, as we host some services which
depend on it.

Change-Id: I7fee4d42db672bffa80fbca953979fad9896880e

playbooks/group_vars/certcheck.yaml

@@ -1,4 +1,5 @@
 letsencrypt_certcheck_additional_domains:
+  - id.openinfra.dev 443
   - openstackid.org 443
   - wiki.openstack.org 443
   - www.openstack.org 443